aging and riding

I am in the process of refinishing/repainting my kitchen cabinets. A tedious job you have to remove doors and handles. Clean, sand a bit, and paint 2 coats. Getting the hinges off and bending and getting on the floor is not easy as it was 6 years ago when I repainted inside of house.
Normally I do  my ride early in the morning and come in and eat good them rest a bit and dive in. Well not the back does not like all the bending and up and down. I was never good at it and not real flexible for sure. On top of that the normal 40-55 mile ride now takes enough out of me that I don't have the pace I once did.
Even 6 years ago I would jump  on bike and ride 50 and come back and go for say 4-5 hours easy. Now I tell you after 2 I am getting wiped. This painting is like painting a bike you have to mask things to avoid problems.
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Deacon Mark