Look at the age your known relatives have died at as along as they were non accidental.

Do an honest review of your own health. Do you exercise, Eat relatively healthy, and maintain a healthy weight? If you don’t do any of these things deduct at least a decade. Smoke/vape(weed or tobacco) deduct another decade.

Go to the Dr for a checkup. If they read you the riot act either shape up or plan to retire early.

There’s no guarantees. I almost bit the dust at 28 when I was at my healthiest. But once I made it past that the second 28 has been gravy.

My family is all over the map. So I’m planning on lasting to 95. IMHO it’s better to have some extra cash left over at 95 and not need it then be broke and have no way of making enough to live on or sponging off my kids.