I’m F50 and just started seeing a 59 year old, wt?

So for some reason my last partners were all 38-40, didn’t mean to date younger, just happened. Anyway, thought I’d try someone older at 59 and after a few dates we decided to get intimate. All was going very well, very hot and heavy and really fun, he seemed to be enjoying me a lot, did some amazing things to me- then he unzipped his pants and, well, not very hard at all, like was so difficult to actually have intercourse. He didn’t say anything or acknowledge and just carried on like it was his normal. Then that was it, no second time, said he’d be good to go again after a sleep. I’m used to virile, super hard and intense sex, this was just meh. Is this usual for older men?