Yes you can, im 16 and i bought 2 earlier this year.
Most teenagers wont, cuz its embarassing (to most anyways)
But you definatly can, some stores have them locked up behind a counter ( high theft item) so you may have to ask for it.
just make sure to read the directions..the tests that i bought were mad wierd and werent the typical pee on a stick kinda thing, they reccomended a cup and dipping it for 3 seconds at a strange angle lol.
Best of luck!