slowing down as we age really is a frame of mind. sure we can't compete at as high a level in your 40's, 50's and beyond when compared to your 20's, but there's no reasons to grow roots into the couch either. just do these three things and you'll be fine
1. find the time to do some daily exercise, even two 12-15 minute workouts per day will pay huge dividends and carry you thru the week to where you have more time on the weekends to do more.
2. make eating healthy the majority of the time a priority.
3. get rid of all the bullshit excuses that are holding you back and expect more out of yourself.
We don't know what our limits are, so to start something with the idea of being limited actually ends up limiting us.
Ellen Langer