Losing the motivation

I'm still looking for a t shirt i saw years ago on the front it said THE OLDER I GET on the back it said THE FASTER I WAS cant seem to find one anywhere.I know what you mean i'm 52 i still love cars but my motovation has dwindeled to almost nothing i go into the shop to work on one of the cars and within 10 min. of staring at it i'm back inside in the ac i have the want to do it just losing the drive i guess [plus all the aches and pains for days after don't intrest me either] some days [altho few and far between]i'll work out there all day into the night till wifey tells me to quit then won't even go into the shop for a week [old age sucks].