How old are you on calendar? I am 85 and have more muscles now than at age 57 when I had more fat than muscles.
I do not lift weights. My exercise is brisk walking with wrist weights every day to cover one mile. I have zero medical issues and can mow my suburban sized lawn with a push mower.
46
You don’t have more muscles. You have the same muscles you’ve always had. Your muscles have (according to what you’re saying) gotten larger and more toned.
Whoa, you are setting a great example!