Basically a while back I took this age calculator test, its not like the other ones where You put Your gender and age and thats it, this is about 50 odd questions that go into to Your diet, physical health, family history of conditions etc.
And so with all this it provides You with Your ( roundabout ) age You should live to.
Mind You, if I were You I'd just get a random zip code and put one in, and when it tells You to get an email in the end, don't worry, this websites been on TV and all that, I did it about 2 years ago and I'm fine.
Anyway, here she be!
https://www.livingto100.com/calculator