Asking about his age would actually only be hypocritical if he were complaining about someone else asking HIS age....do you know what hypocritical means? Maybe not.
Here, let me give you an example. Let's say someone lists some games that, in his opinion, will be good. And someone else says "Wow, your taste sucks!" in response to this, probably on account of lower than average intelligence mixed with amazing immaturity and a penchant for being a whiney dick. This person is then called a moron. Then, someone else comes along, and defends this person who was attacking someone else's opinion by saying....."he's not a moron, he just has a different opinion".
See the relationship there? That would be "hypocrisy". Stay in school.