Rob9876
Contributor
My son was 13 when he was certified in Cozumel, and it was a great. Since you mentioned your son is mature for his age, it sounds like it should be fine. I'd definitely go with a dive op with smaller boats, not a big cattle boat.
Also, as an alternative to a private DM, you may consider going ahead and getting his AOW while you are there if they'll allow you to tag along with them. That gets him 5 dives with a DM also, and may be a cost effective alternative to just paying for dives and a private DM -- plus he'd have the AOW cert (seems more and more dive ops in the U.S. are requiring AOW for many dives). After the 5 AOW dives you can decide whether you want a private DM for the rest of your trip or not. I'll add a plug for Tres Pelicanos (small fast boats, and great dive op overall) and their DM Jose is really patient and calming with inexperienced divers (and great at finding cool little critters too).
Also, as an alternative to a private DM, you may consider going ahead and getting his AOW while you are there if they'll allow you to tag along with them. That gets him 5 dives with a DM also, and may be a cost effective alternative to just paying for dives and a private DM -- plus he'd have the AOW cert (seems more and more dive ops in the U.S. are requiring AOW for many dives). After the 5 AOW dives you can decide whether you want a private DM for the rest of your trip or not. I'll add a plug for Tres Pelicanos (small fast boats, and great dive op overall) and their DM Jose is really patient and calming with inexperienced divers (and great at finding cool little critters too).