When people don't show their gender or age?

Yes fair enough.

And while on this topic, do you really think that just because someone puts a certain age next to their username, as well as a gender that they automatically are those things? People are always joking on this site about cat fishing, fake accounts and creepy old men pretending to be young girls. If you really want to know someone read their stories and pay attention to their responses. Put some effort in. Don't write people off based on something so trivial, and don't assume nasty things like we're trying to "hide". Maybe we just don't want unwanted attention from creeps who are only after one thing.

@Aletheia: you don't think I don't get my share of pervs pretending to be women? Well I do. I despise catfish! So that's why the bad flavor.

Then aim your accusations in the right direction.