Jimmy,64 here also,you do not just jump into excersize after a yr of doing nothing, you know better.
With the help of nobody but my wife, I have moved 11,000 lbs of my shop 150 miles north over the past couple mos.Was I sore the next day (s) you betcha.
I have cut and taken 5 truck loads of tree and yard debris to the dump in the past two weeks,was I sore the next day,yep.Have double dug my wifes winter garden,about 12x20,dug post holes to make a boarder set in concrete,not so sore the next day,a no advil day) ease into it young fella,we may be used, but we ain't used up)