We aren't fighting age or "working out", we are all training for life. It changes your attitude to train for something rather than "work out". Some of us train for powerlifting, some train for In-Line skating, some for Olympic lifts, some for bodybuilding, etc...
I agree with Dog... I have always been a gym rat through the years, but never really had any focus or goals other than to look decent.
I decided about a year ago I needed motivation, and powerlifting seems to be the focus of my attention currently. Had one competition... had a great time and met some super people. I am hooked now, and stronger than I have ever been at 43 years of age.
Find something to shoot for... strongman, powerlifting, bodybuilding, an upcoming vacation, arm wrestling meet, high school reunion... something. Leave no stone unturned, enjoy life and do everything you want.