Im old nobody wants me

I'm sure you will find someone. You need to meet people whether it's online or you are out socialising.

I'm sure there are some women your age who would be interested in you if you had more confidence in yourself and presented yourself well

Ok

Find a passion

That sounds like a mental problem and not a physical one.
People are attracted to confidence, sexiness, happiness, and a person that likes who they are at any age. I see my body creaking and cracking too but I refuse to die before Im dead.
As long as I live I will do it fully and I look good and feel good. You should feel that way too.

Nonsense... pick yourself back up, dust yourself off and get back out there!!!