Frequently Asked Questions

Longlevity gives you a personalized life expectancy estimate based on CDC data and research covering 40M+ people. You answer 11 short questions about your health (sleep, exercise, diet, stress, relationships, smoking, alcohol, purpose, preventive care, body weight, and family history), and we combine your answers with actuarial baseline data to produce an estimate, plus an action plan showing which habits are pulling your trajectory down. Full methodology: see our methodology page.

Not in the way people usually mean. We're not an LLM, and we're not an AI "coach" that improvises health advice. The ".ai" is simply our web address, a short and memorable domain. Your estimate is never generated by AI: every number comes from published CDC actuarial data and peer-reviewed research covering 40M+ people, computed by a transparent, versioned model you can inspect step by step on our methodology page. Where we do use AI is behind the scenes, while we build and refine that engine: reviewing new research, stress-testing the calculations, and keeping the model current, so it stays as accurate as possible. It never sees your answers and never computes your result. AI in service of the science, never a substitute for it.

It's a statistical estimate based on U.S. population-level research, not a prediction of your actual lifespan. Effect sizes come from meta-analyses covering 40M+ people. Your individual outcome depends on factors Longlevity doesn't measure (genetics, medical history, specific medications, environmental factors). Treat it as directional guidance, not a fixed forecast.

No. Longlevity is an educational tool that provides estimates based on statistical population-level research. It is not a medical device, does not diagnose or treat conditions, and does not replace professional medical advice. Always consult a qualified healthcare provider before making significant changes to your health, diet, exercise, or medications.

Your archetype is one of seven research-backed patterns that describe your health profile: The Burnout Runner, The Coaster, The Optimizer, The Stress Carrier, The Late Starter, The Blind Spot, or The Builder. Instead of just a number, your archetype captures the shape of your habits: which ones are protective, which are pulling you down, and where to focus first. Full explanation: longevity archetypes.

No. You can take the full assessment, see your estimate, get your archetype, and view your action plan without providing any information beyond your assessment answers. An email is only needed if you want to save your results to a free account (to track over time or return from another device). There are no passwords to remember: you sign in with a secure magic link sent to your email.

Yes, genuinely all of it. The full assessment, your estimate, your biological age, your archetype, your personalized action plan, unlimited re-measuring, and your trajectory over time are all free, and you can save them to a free account. Nothing is gated. We're giving the whole product away while we're in early access.

Adults who want a realistic estimate of their health trajectory and actionable, science-backed guidance on what to change. It's designed for users 18 and older; teens 13 to 17 should use it only with a parent or guardian's involvement, and it isn't intended for children under 13 (we don't create accounts or collect email from under-13 users). It's built primarily for users in the United States: baseline life expectancy varies significantly by country, so estimates may be less accurate elsewhere.

After you complete the assessment and build your action plan, enter your email and we'll send you a link. That link is how you return to your plan, across any device, any time. We also store your plan server-side so any changes you make (marking items complete, adding new habits) persist automatically.

Check your email for the plan link we sent you. It's the same URL every time, and it loads your most recent plan state. On the same device, your browser also remembers your plan for up to 7 days (or 2 hours once you've completed your assessment, for privacy on shared devices). If you cleared your browser data or switched devices, use the email link.

Yes. Click the link in your plan email from any device: phone, laptop, tablet. Your plan state is stored server-side, so any updates you made on one device are visible on another. Use the same email link you received when you saved your plan.

Enter your email on the site and we'll send you a fresh sign-in link. Click it and your saved plan and history load automatically, on any device. There are no passwords, so there's nothing to reset. (You don't need to redo the assessment to get back in; re-assessing is a separate, optional step for re-measuring your numbers over time.)

Your account data (saved assessments, plan, and any purchases) is kept for as long as you have an account so you can return and continue tracking. If your Longlevity Plus expires or you get a refund, your data is kept dormant (not deleted), so your history is intact if you come back; individual assessment snapshots are retained up to 5 years each. People you add to Compare stay with your account until you remove them; compare and gift links expire after 90 days. You can delete all your data at any time via the "Delete my data" link in any email we send.

Yes, if you create an account and save your plan. We send a check-in reminder about a week after you build your plan, plus recurring check-ins at the cadence you choose (default monthly), and we'll invite you back for your "annual longevity physical," a full retake so you can see how your trajectory has changed year-over-year. Every email includes a one-click unsubscribe, and you can stop the reminders any time.

Everything. Your assessment, estimate, biological age, archetype, action plan, habit tracking, unlimited re-measuring, and your full trajectory over time are all free right now. No card, no catch.

Not yet. While we're in early access, the whole product is free and there's nothing to buy. A membership, Longlevity Plus, will come later as we grow, and we'll be clear about what it adds and what it costs when it does.

No. Everything is free right now, and creating an account is free. There's nothing to buy.

Right now there's nothing to buy, so there's nothing to refund. If we introduce a paid membership (Longlevity Plus), the policy will be simple and no-fuss: a full money-back window of 30 days, requested from your account or by emailing contact@longlevity.ai, processed via Stripe, with your saved data always kept (not deleted). Anyone who purchased before the free launch keeps those same 30-day terms.

We collect only what you provide: your assessment answers (habits, age, gender, height/weight), your first name (if given), your email (if you choose to save your plan or make a purchase), and basic analytics (page views, referrers, no personal tracking). We do not collect location data, contacts, browsing history, or any other ambient information.

Yes, anytime, in one click. Every email we send includes a "Delete my data" link at the bottom. Click it, confirm on the resulting page, and all your data is permanently removed: your plan, purchase history, follow-up records, and any snapshots. The unsubscribe preference is preserved after deletion (required by CAN-SPAM law, so we never accidentally email a deleted user). Full details: Privacy Policy.

No. We do not sell, rent, or share your personal data with third parties for marketing or advertising purposes. Ever. Your assessment answers are used to produce your results and nothing else. We have no business model that involves selling user data.

Only with the infrastructure providers needed to run the service: Cloudflare (hosting), Resend (email delivery), and Stripe (payment processing), plus Google for anonymized analytics and the site's typeface (no health answers, names, or email addresses are sent to Google). Each handles a specific piece of the system and is bound by its own privacy agreement. We do not share your data with advertisers, data brokers, or health companies.

We use HTTPS throughout, HMAC-signed tokens for sensitive actions (unsubscribe, delete, refund), and server-side storage isolated per user. We are not HIPAA-covered (Longlevity is an educational tool, not a medical service), so we make no claims of clinical-grade compliance. But we treat your data with more care than the legal minimum requires.

Full details are in our Privacy Policy. The short version: we collect what you give us, use it only to provide the service, store it for the minimum reasonable time, and let you delete it whenever you want. No surveillance, no ads, no data brokering.

Check your spam folder first: transactional emails occasionally get flagged on first contact, especially on Gmail and Outlook. If you don't find it, try again using the same email (we'll resend). If it still doesn't arrive within 5 minutes, email contact@longlevity.ai and we'll investigate. Common causes: corporate email firewalls, old forwarding rules, typo in the email address.

All modern browsers: Chrome, Safari, Firefox, Edge. The site works on desktop and mobile. If you're on a browser older than 2021 or a specialized platform, some features (like the interactive compare visualization) may not render correctly.

The quickest way is the Feedback tab on the right edge of any page: tell us what happened, which page you were on, and what you expected. It comes straight to us. For anything detailed, or to attach a screenshot, email contact@longlevity.ai with your browser and device. We read every report and typically respond within a day or two.

Yes, but with a caveat. The baseline life expectancy is calculated from U.S. CDC data, so if you're in a country with significantly different life expectancy, your estimate may be off by a few years. The habit-based adjustments (sleep, exercise, stress, etc.) come from international meta-analyses and apply broadly. Treat the estimate as directionally right, not precisely calibrated to your country.

Email contact@longlevity.ai. We're a small team so response times vary, but typically within 24-48 hours.

Yes. We work with life insurance companies, corporate wellness programs, and health platforms who want to offer a longevity assessment to their customers or employees. Email contact@longlevity.ai with "Partnership" in the subject line.