Charger,
You have 2 years left. At 40 you find the the edge and fall off. You then quit thinking of being 20 yrs old with a car full of girls, and start thinking about being 25 with a head full of hair.
I used to lift a little back in my 20s when I was in the military. I had no routine other than go lift. It's all so scientific now. My stomach must have been sagging a little too much because my wife bought a membership to the local gym here. Anyway I began again and the strength I had 12 yrs ago came back... mostly, but I've only been back at it for 5 months so hopefully age doesn't matter that much if diet and the routine are balance properly. There's a guy there at the gym that is 6 yrs older than I and he looks like he's in great shape, with the exception of the thin gray hair. I don't think you need to worry about how much time you have left. You can eat right, lift, and get good rest and keep up with most of the youth around you. Just do it and forget about your age. Just don't look at the wrinkles. Build, and stretch that skin back out.
JC
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On the Down Hill