Speaking as someone who wet the bed until I was 17, I thought I'd put my input in.
First of all, unlike what a few posters have said here, wetting the bed at this age doesn't necessarily mean that there is something "wrong". There actually wasn't anything wrong with me either (this was backed up by specialists and doctors).
However if I'd posted for help back then, I'm sure most people would have been thinking
and posting how that it wasn't "normal" and that there must be something wrong with me. Or in the case of Serendipity30 "something very very wrong" and would no doubt suggest that I need to see a psychologist
.
However for me it was simply a case of my bladder not sending signals to my brain. I'm paraphrasing here a bit but basically it was explained that peoples bladders become "trained" to send signals to their brains whilst their sleeping to let them know it's full so they can wake up and go to the toilet. However some people's bladders simply take longer to be trained to do this (evidently mine was) so have to be "re-trained" so to speak. To do this I had to have a bed wetting alarm - the idea is to "train" your bladder to send signals that you must wake up when you need the toilet.
For me it worked and I've been dry ever since. So I really do think the doctors were right and that for me it was simply a case of my bladder needing re-training as opposed to there being something terribly wrong. I was also told that bed wetting in teens and adults is actually more common than people realise.
Don't get me wrong, I know that that bed wetting at this age can be caused by psychological issues and more serious physical issues so I'm not saying that it's not the case here. However I think scaring the OP by saying her child needs to be referred to a psychologist and that something must be very wrong is just silly IMO. Especially as it's more likely that his bladder simply never "learned" to send signals to his brain whilst he's sleeping and he simply needs to be re-trained to do that with a bed wetting alarm or through other methods (and there are other methods, I just never got to that stage).
OP, has your son seen any specialists or tried anything like a bed wetting alarm? If not then I defiantly recommend a visit to the GP to give it a try because they really do work IME.