Question about credit cards

Question about credit cards

A few years ago, I received one of those "You've been preapproved!" offers from Capital One in the mail. Under the Terms and Conditions section, it said you must be 18 to apply for credit. I was only 17 at the time, but decided to fill it out anyway. I put my actual age and birthdate on the card, but they issued a card anyway, even without a cosigner or anything. Are they allowed to do that? Just in case anyone's wondering, I AM paying them back, so please don't think I'm trying to get out of paying them. I was just wondering what the rules are for that kind of thing. :)
Mystery

Mystery

Suggestions for the living room

Suggestions for the living room

Amaryllis cultivar ID?

Amaryllis cultivar ID?

No longer in an apartment, but…

No longer in an apartment, but…

Tonights highlights

Tonights highlights

Please help identify a flower bulb.

Please help identify a flower bulb.