I feel just like a newborn baby

Two elderly grandparents from a retirement center were sitting on a bench under a tree when one turns to the other and says:

“Slim, I’m 83 years old now and I’m just full of aches and pains.

I know you’re about my age

How do you feel?”

Slim says, “I feel just like a newborn baby.”

“Really! Like a newborn baby?” “

Yep

No hair, no teeth, and I think I just wet my pants”