Years turns the quiet signals your Apple Watch already hears into your biological age — then shows you the face time meant for you. One honest glance a day, for years — that's the whole practice.
Four things a day: your biological age and where it's drifting, a render of you at your calendar age, one thing to do at an hour that's yours, and the heartbeats you have left.
The number runs cool blue when you're younger than your years, warm amber when you're older.
No streaks, no plans, no supplements — and nearly all of it optional, the face included. Bring your patience: the number moves in months, not days — but it moves, if you keep at it.
Most health advice assumes an empty afternoon. Years reads the night your watch actually sees — not the one on the clock — and asks for one thing, sized to a moment you'll reach: before you turn in, or next time you're up. Not right now, if right now isn't yours.
Notifications follow the same rule: one arrives only when you're behind on something that can still be fixed — never for a streak, and never to pull you back in. Three a day is the ceiling; most days, nothing at all.
Two things, each only when the feature runs. The selfie you choose for your render — together with your calendar age and biological age, the two numbers the render needs. And a short daily summary of derived health metrics (biological age, heart-rate variability, resting heart rate, sleep, steps) that writes your daily message. If you filled them in, that summary also carries what you've told the app about your life: the "about you" note, and your answers to the optional routine survey — desk or on your feet, how much free time and work pressure you have, who else depends on you, where you can move, how much effort you can commit. Both start empty; leave them blank and nothing about your circumstances is ever sent. Raw Apple Health data is never sent anywhere.
Your selfie goes to Google's Gemini image model — that's what draws the you whose biological age matches your calendar age. Your health summary goes to Anthropic's Claude — that's what writes your daily message. Both requests travel encrypted via OpenRouter, the API service Years uses to reach those models; if OpenRouter is unavailable, the render goes to Google directly.
Years runs no servers, so we keep nothing. OpenRouter doesn't store the content of requests — only billing metadata like token counts. Google retains abuse-monitoring logs for up to 55 days, then deletes them. Anthropic deletes inputs and outputs within 30 days. None of them use your data to train models.
Your Apple Health data — it's read on your iPhone, and your biological age is computed right there. Your photos and renders, stored only inside the app on your device. Your history. Your notifications too: every nudge is decided, written and scheduled on your iPhone, so that whole channel never touches the network. There is no account, no analytics, no trackers, and no third-party SDK in the app at all.
Static files, no forms, and one script: Cloudflare Web Analytics. It's here for one reason — so I can tell whether anyone is actually reading this page, and where they heard about Years. It records page views, the referring site, your country, device type and browser, and how fast the page loaded. It sets no cookies, keeps nothing in your browser, doesn't fingerprint you and can't follow you to another site — Cloudflare counts page views, not people. There's no account and nothing to fill in here, and none of this touches the app, which carries no analytics at all.
Straight from the code and the providers' current terms — last reviewed July 2026.
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