I'm going on 73 and a press up would be akin to leaving a suicide note....and effect wife's insurance payout.....though she does encourage me to keep fit....You don't need a gym to lift weights or do press ups. Think about what you have access to. Fill a couple of buckets with soil or use a bag of sand. I’m 68 and could do 5 press ups easy.
So get to it, grit your teeth and crack on, good luck.
Joking aside...you can do it.....