Exciting new research has been release regarding aging and muscle growth. IT used to be believed that after a certain age 79 plus that it was very difficult to build new muscle in fact virtually impossible. It is now known that it is not the fact; in reality and elderly individual following the same training program as a twenty year old will make the same muscular gains, thought they will take longer to adapt. What makes this research exciting is that it proves it is never too late to become active and start weight training. You will derive benefits whether you do it preventatively in your youth, start in middle age, or even as a senior.
So dust off those running shoes and spandex, invest in some weights, get a trainer, go to the gym, and get going!