As an outsider looking in, the fact that you've never seen this guy even in a picture shocks me a lot more than the age differene. Surely every 22 year old who has been on the internet long enough to form a friendship would have found the time to get a few pictures of himself online, whether it be a camera of his own or pictures others have taken out and about?
Be careful, look after yourself mate.
Be careful, look after yourself mate.