I think that age as a number is not nearly as important as health. You can be in poor health and be pretty miserable at 40 or 50. If you're in good health, you can enjoy things into your 80s.
I watch too much cable, I admit. Day after day it gets frustrating. Yesterday I watched as someone called legislation to prevent teacher layoffs a bailout - but I know that's not a view held by many, nor were the views I was frustrated about.