As I approach old codger status, one thing I’m happy about - besides my stunning good looks, staggering intellect, stupendous kindness (and I’m sure many other fine qualities my humility prevents me from discussing) - is that I am still really flexible.
Flexibility. It’s important. Work at maintaining it. Stretch every day. You don’t have to become a yoga master, but do some stretching exercises every day. Your older self will thank you.