To be fair there is a decent balance here. Many of the permanent ex-pat residents are older, while there is a good sprinkling of young'uns here for 6 months or so. Myself, I'm 52 and semi-permanent, and like to head out for a pint with other ex-pats on a regular basis - keeps me sane at times. When we arrange meet-ups, they are not age restricted, although we don't go off clubbing it, we usually meet in a bar that has decent beer, good craic, and chat for the night.
Last weekend we went out, there were around 10 of us altogether, I would guess that there were three of us over 50 (and young!), a couple in their 40's, two or three in their 30's, and also a couple of 20 somethings, so you can see a good mix.
Not sure what you are meaning by companionship, friendship, or partner seeking? With us lot we can certainly supply the former, and if it is the latter, we can point you in the right direction. Keep an eye out for our next trip out.