For you young men and women, don't get overweight and out of shape in the first place.  As a young man I liked fashionable clothing and wimmmen, great motivation to be in shape.  Once I got married at 46 I didn't work out too much anymore, but I remained active, wife made sure I ate right.  Eating right wasn't enough for me not to get diabetes 4 years ago, history in my family.  I'm 68 and have been retired from day to day business activity for 10 years, I have fished almost every day for those last 10 years.  My diet, non sedentary lifestyle is keeping me in reasonably fit condition, at least from a fishing standpoint.  Don't often get tired or sore but I don't push myself, age does have it's limitations.

For the people losing weight, keep up the good work.

I ride my bicycle  with one guy that is 67 and the other is 70. There are also many others in their 50's like me. We all go out together and ride 30 to 100 miles at a time. Age is only a number if you stay in shape. You can't let your self get to the point of no return.

I personally do the elliptical for 20 minutes Mon-Thu in the am. Fri consists of a full body circuit for 20 minutes. Rest sat and sun.