Facing up to your age can be a bit hard if you have an ego.
Your body is probably not as coordinated as you might imagine and you may not be as fit as you once were.
You may not be overly motivated.

Accept all this.
Fighting against the reality of aging is foolish and pointless.
Just do what you can.

It may take you longer to learn things than you expect... so what?
You are not in competition with anyone.