60 used to be old. 80 was ancient. 90 was a walking corpse... if they could walk at all. People are living longer and are heathier than previous generations for the most part. I think it's more a mindset than anything else. I know people younger than me that look and act like they are in their late 80's. My daughter is in her mid 30's and complains that her 20-something co-workers act older than me and are "sick" all the time.
My 92yo mother is in better shape than most people my age (62). She's shooting for by passing 100yo. Our theory is because she doesn't go to the doctor except once a year as she has mild high blood pressure (probably due to going and sitting in a doctor's office - she had a really bad experience with an idiot doctor). No drink, no drugs, no smoking. We all grew up on a typical Southern diet too.
The only ones in my maternal side of the family (the side I'm close to) that are in poor health and die early are the ones who believe that doctors know what's best for them and the ones who abuse drugs and alcohol. I'm pretty sure my mother will pass 100yo. And she still drives long distances in her car. I plan on surpassing my mom in years. As long as I'm healthy and mobile, I plan on keeping going.