My son shoots a Maddog pup, and it is awesome…it’s a scaled-down version of an adult longbow.I would think the appropriate time to “step up” to an adult bow would be more based on draw length and overall body build rather than age. Most youth bows I’ve checked out seem to mention draws of 24” or 26”.
We like St Joe river bows in our house. They are well made, come in a variety of cool colors for the kids to choose from, and they offer a trade in/upgrade program as your kid grows. We will be picking up another one at ETAR this year. Kids grow to fast!