I'm 40 and we definitely did Hallowe'en when I was growing up in Ireland. I remember the excitement of seeing all the masks in the shop beside my primary school. Pumpkin jack o'lanterns weren't a thing back then, but we did see them in American media. I know there's an Irish tradition of carving turnip jack o'lanterns and I have a vague memory of aching hands from trying to carve one myself, but I couldn't swear to it. We also went trick or treating around neighbours houses, but I don't remember if we actually called it that.
My brother is keeping the old Irish Hallowe'en traditions alive with his kids. Trying to eat an apple that's hanging from a string with your hands behind your back, eating a grape from a mound of flour without getting any on you and so on. Ok, they're not great, but they're traditional!