After 50 no more options.

[Walzer]

I think that before you are 50, you can exercise for looks and health. If you miss some or stop for a while, not big deal. But, after 50, exercise need to be part of your daily life. It is no longer an option. Look around. Do you want to not be able to have to hobble around when you are 70? Do you want to drive? Yes, do you want to have more than a plutionic relationship? Exercise.