My situation is similar. I am too old to have romances with the females that enjoy being around me. Not that I'm against dating someone much younger, ENTP's can go way outside the lines, but you INFJ's won't go that far off the beaten path.
I have a great 23 year old friend (younger than my older daughter) who clicks with me, she's even tried to seduce me. But casual sex isn't my bag at this point.
Your ENTP guy that you dated reminds me of when I was younger. ENTP's are problematic before they mature. And while others are likely to do so in their 30's, ENTP's usually mature in their 40's.
We finally are able to settle down and focus then. A little. Enough to be able to play well with others.
I cannot get along with other ENTP's. I'm confident that is nearly a universal truth for ENTP's.