Do you think there's an age limit for being an anime fan?

I'm thirty-five this year. My friends around me are already married with kids, and I'm the only one still chasing after shows and buying figures. Sometimes I wonder if I'm being too childish. But every time I watch a good series, I feel like age has nothing to do with interests. I was chatting with a fifty-year-old colleague recently and found out he's a die-hard <i>Gundam</i> fan with an even bigger collection than mine. So... is there really no age limit for being an anime fan? How old is the oldest anime fan you know?