I gave up jogging because it caused my beer to foam up.

I'm a bit older than the baby boomers, but I use a Bowflex 3-4 times per week. Not trying to build muscle so much as to keep the flexibility I've got.

My wife has been a distance runner, jogger, etc most of her life and her joints are holding up well. She does try not to run on asphalt or concrete though.

Walking is a great exercise.

just my $.02,
Wes