If the purpose of it is a cool gee whiz gaming machine, rock on!

If it has anything whatsoever to do with "learning to fly" that's a lot of money that could go towards actual flying. Could be enough to solo in a glider plus a nice intro to powered, or enough flight instruction in powered to the pre-solo and intro to X-Country for when he's old enough to go for ratings. Any kid more interested in the graphics of how realistic it looks versus the actual realism of really doing it, for real, kind of proves its not about learning to fly even a little bit. And that's OK, as long as they understand that's what it is.

Just get a PS5, HOTAS and VR setup and play Star Wars Squadrons. Or a MUCH cheaper rig and one of the older, but still very very good, FS or X-Plane programs. But if the actual interest is real (which, if unsure, can be fleshed out with a simple "discovery flight") then blowing close to 3 stacks on a pretend machine is more of a hinderance than a help and is little more than an expensive Baby Einstein placebo.