At what age did you/your DC realise that Santa isn't real?
I was about 10 when I finally plucked up the courage to ask my sister and learnt the truth, although I'd suspected for a year or two before that. My eldest DS is 8 and I suspect he's not quite as sure on Santa being real as he was last year. He's not asked outright but he seems less into the idea. His little brother is 6 and definitely still believes.