Terms of use

Longstanding is a measurement and planning tool. You choose what you want to still be able to do at 85, do a set of field tests yourself with a timer, a chair, a bar and a few other things, and re-test every quarter. Each result is read against a published reference table where one exists, and against a line worked back from the goals you chose.

It is not medical advice, and it is not a medical device. It does not diagnose, treat or prevent any condition. It is screening, not diagnosis: a low result is a reason to talk to a clinician, never a verdict.

The research the app cites is mostly observational. It shows that people who can do these things tend to live longer, not that changing one number will change your outcome. The app does not predict your health or your lifespan.

Some tests are hard efforts: the field VO₂max tests and the stair climb in particular. Skip any test a doctor has told you to avoid, and check with a clinician first if you have a heart, joint or balance condition, are or are recovering from an injury. Stop a test if you feel pain, dizziness, chest pain or unusual breathlessness. Each test page lists its own safety notes. You decide whether a test is safe for you.

The baseline is free and complete: onboarding, your age-85 goals, and the full baseline session, with every result read against its source.

After the baseline, one payment of $29 (the US price; the store sets the price in other countries) unlocks everything that follows: re-tests, reminders, the backcast line for each goal, history, the quarterly sheet, share cards, and CSV export and import. It is a one-time, non-consumable purchase. There is no subscription and nothing renews.

On the App Store, Family Sharing is on for the purchase. If you reinstall the app or move to a new phone on the same Apple or Google account, use “Restore purchase” on the unlock screen.

Purchases are made through the App Store or Google Play. They take the payment, and they handle refunds under their own policies; we cannot issue a refund ourselves. To ask for one, use Apple’s report-a-problem page for a purchase on iPhone, or Google Play’s refund page for a purchase on Android.

Your profile, goals and results are stored in a database on your phone. There is no account and no server that holds your data, so we never see it.

You can save a backup file at any time and keep it wherever you like; it is yours to look after. On iPhone, your device’s own iCloud Backup also includes the app’s data, under your Apple account. If you delete the app or use “Delete all data” without a backup, your results are gone, and we have no copy to restore.

The privacy page says exactly what the app and this website handle.

If you allow it, the app reads a few types of data from Apple Health or Health Connect: VO₂max, workouts with heart rate, and resting heart rate. It only reads. It never writes to Apple Health or Health Connect, and what it reads is used on the phone and never uploaded. Every value can also be entered by hand, and you can turn access off at any time in your phone’s settings.

Percentiles come from published tables, and each result names its table with the year, the sample size and who was sampled. Those tables have limits: some samples are small, some come from one country or one clinic, and devices and protocols differ. Where no table exists, the app shows no percentile; where a table has to be read loosely, the result is labelled estimated. A watch VO₂max is an estimate, not a measurement.

A percentile places you among the people in that table. It is not a precise measure of you, and the app does not promise that any number is right for any one person. Tables may be updated in a new version of the app when the research changes; your measured values never change, and the app says which table changed and when.

Each test page lists the limits of its reference.

If you get the app from the App Store, Apple’s standard Licensed Application End User License Agreement applies to your use of it. These terms describe the app in plain words alongside that agreement. On Android, Google Play’s terms apply to the purchase.

The articles, study pages and calculator on this site are information, not medical advice. The calculator runs in your browser and uses the same scoring engine as the app; what you type there is not sent anywhere.

We may update these terms when the app or the law changes. The date at the top shows when they last changed. If you keep using the app after a change, the updated terms apply.

Questions about these terms, a purchase or a result go to renato@bulholabs.com. The support page answers the common ones.