No, i dont think age has anything to do with it. But maybe you are pregnant and its too early to see yet. So you might have to wait a lil before you can check it. But this happend to me few times and also never happend to me before. i had brownish stuff to for like two days and absolutely went away and i've been tired, moody, going to the bathroom alot, drinking alot, and abdomial main. But everytime i took a test, it always came up negative. It havent happend to me seens but i thought i was pregnant at the time too. But you never know, everybody has diffrent bodys, which is why you should check it again to make sure you arent or you are. Anyways good luck.