Introduce billiard for my elder boy

My hubs has been thinking to introduce billiard to his elder boy, gosh, my elder boy is just at 7 years old, is it too early to let him know what is billiard? I have always thought that he should have concentrated in his study rather than spending his spare times in playing games, some more he is still young. But since hubs is insisted, then i could only support his decision and help him order some cheap billiard related things from billiard supplies. As long as the boy knows how to handle both things then actually it is no harm to let him play billiard at such young age.