How hard is it to cry when you're an adult?

I cried a lot as a kid including in my teens. Most of my tears were about my mother who made it crystal clear she neither loved nor even liked me. She was horribly abusive both physically and especially emotionally. She had a lot of contempt for my tears and had a little sarcastic contemptuous smile when she got me to cry. She once said, "The sound of your sobs is to me like the sound of a fine symphony orchestra tuning up."

I left home at age 18 and never went back again. Learning to live on my own was hard for me and somewhere during those years of adjustment to adult life, I stopped being able to cry. After I left my parental home, I never cried again until in my mid 40s when a very good close friend of mine went to visit a foreign country and suddenly died there at age 39. I cried a lot for several days. But I am in my 70s now and I find myself unable to cry even though I have lost other friends to the Reaper. I just can't seem to let out tears. I sense I would probably feel better if I coukd cry now and then. But it just doesn't happen.

Anyone else out there who can't cry even when it would be socially acceptable or appropriate (like at a funeral)?