Everyone over the age of 10 has obviously had a bruise before.
I'm 20, and Im telling you I haven't. I've been looking for them since I was 7 or 8 because I was the only out of my friends and family that hasn't had one at the time...and I still haven't.
I have at least 6 bruises at all times. All come from no where. Most are on my legs. I looked into it and I'm pretty sure it's anemia since it seems to be a sign of it and I have like all the symptoms. My parents never take me to the doctors though ever so who knows.
I find random bruises on my body every other day. A few months ago I was confused as to why everyone on campus was staring at me, until a friend of mine pointed out that I had a big ass bruise on my forehead that showed up out of nowhere.