Is it possible to develop it later in life.?

Yes. You can develop allergies at any time, I understand.

yep, mine started about the age of 19. Pretty mild for years but has got much worse in recent year, I'm nearly 40 now. Hate it.

Yes, I never had it as a child, but I have been suffering with it for the last 8 or nine years! 🙁

Yes. I never noticed any effects until I was well into my thirties. I don't get it bad, just enough to be irritating. (Pun!).
Seemed to coincide with developing an allergy to cats as well.

Seemed to coincide with developing an allergy to cats as well.

Bingo.! Same here. 🙁

Yes, over the last two years (I'm 27) I've become progressively more allergic to EVERYTHING – hay fever and dust is the worst. Actually no, total intolerance to alcohol is the worst (aah, for those carefree student days…)

probably not the cat that your allergic to but the dust & pollen it brings in on its fur

mine hasn't started yet but when it does I swear by Beconase nasal spray