I’m 57 and have pulled a muscle hiking so my hip hurts, I do get more tired but walk and do dance classes :) DS and his GF have suggested doing light weights, I have tried at home but am considering joining the gym for actual instruction.
The alternative is death, my DD died in her twenties and DH and I have had 4 friends die aged between 38 and 54 so I embrace the tiredness and aches and feel it’s a bit of a privilege.