I don't know. The walk down to this beach is fairly easy, just a small sandy slope in spots that they did tell us to go slow so we didn't slip.
Do you think it might be due to transportation and not being able to do child safety seats?
After the ferry, we rode in an open air bus/trolly type thing - similar to the taxis in St. Thomas.
But still, you could probably go ages 3+ with that reasoning.