It's not their fault, it's me. I'm 71 and have been on serious antidepressants for a long time. ED has frequently been a side effect, but the cause doesn't matter.
The women I've seen, almost without exception (1, maybe 2) have, or seemed to have done their best to make me cum. There's professional pride and frustration on her side involved here (I, personally, are not frustrated) and I do my best to assure them it's not for their lack of trying.
That's when I get asked how old I am. I say 71 and the response is usually surprise, saying 'you look sixty'. If they knew I was 71 at the start, would it matter -- not to these professionals. It's important to me that they know how I much I appreciate what they do and that I'm really OK at the end.
My criteria for success is simple: Did I have a good time?