Sudden old age

I've had about 10 sudden physical changes in the past 6 weeks. Suddenly I realize I am old. I always liked being old, because I felt better then I ever did in my life. I had learned so many ways to take care of myself. Now I don't like being old. So many things have quit working. I am, however and of course, grateful I can still walk and my overall bodily functions are in good condition. But I've lost some functioning.