I know YC doesn't discriminate on age, but it really does seem like they are looking for people in their 20s. Their application asks for your HN ID for instance

I know YC doesn't discriminate on age, but it really does seem like they are looking for people in their 20s. Their application asks for your HN ID for instance. This is the second time I've come across the assumption that folk on HN are all in there 20s. Is there a breakdown by age somewhere I'm unaware of? Most people I know in person here are in their thirties or forties :-)