Who says being with older men is "so wrong"? Once you're an adult, you're an adult.
It sounds like you might have an easier time getting something close to what you're looking for if you went to a sauna.
Try The Boilerhouse.
I've never been and I have no idea where it is, but I'm sure it's in Dublin, and I'm equally sure Mr.Google can help with the rest. If anything younger people tend to complain that the people there were older then them so for you, that should be ideal.
Just laminate a card with your specific sexual fantasy on it and wear it round your neck, perhaps have a diagram on the back. I'm sure you'll find your tall, and two regular height, older gay men who will play ball, if you'll excuse the pun.
(that last paragraph was humour, but I do wish you well