True, Tis. And for many, life hasn't been the greatest. Personally, I have no desire to go on and on, and yes, I do know what I'm talking about, my daughter died nearly 5 years ago, from cancer, she was 9. It's been a tough go, I know from others much farther down the line, this will always be so, I don't have any wish to be here for ages and ages, but I accept it's mostly beyond my control.
Have some lovely friends who are 66 and 70. They are living it up! He homebrews and I'm sure they're over guidelines or units or whatever. They don't care, they're enjoying themselves because they know, that door won't stay open forever, and no matter how 'healthy', people slow down and get old and it's got a lot of unpleasant drawbacks. My dad's been frank about this, himself being nearly 81.
I think what it boils down to is a lot of people want to have control, or a sense of control, over mortality that actually is largely an illusion.