Grrrr.. Too old to hike already?

I sprained my ankle again, this time it went over to the outside.  All I was doing was walking in my yard.   I actually thought I was ready to go hiking again, I was just waiting for my flu/cold/sinus infection to go away.  I'm not at all pleased.  Physical therapy did not work, in fact I think it was a waste of time.  My hiking days may be over, I don't know.