My son is going to be 5 in a few weeks but he has been taking Kuk Sool Won for about 6 months and I tell you what I would gladly put him up against most older white and some yellow belts when it comes to proper beginning hyungs (forms). I am so amazed at how much he can actually retain and I never force him to go he is always asking me when it is Kuk Sool time hahaha.