I've aged.. alot..
I played badmint0n, after 6 years! I get body ache v easily. My body is not as strong as a normal 20+++ yr-old adult.
And recently, I got back ache, which lasted for abt 4-5 days, and I couldn't even stand straight after I climbed up from a chair.
Yesterday, I used my right arm to push sth. And ended up with a pain in my right front shoulder blade.