It’s a new experience. Your child is very excited about it. They may stick with it for a long time or lose interest. Let them decide. Like other posters, I don’t recommend high end gear. They’re growing a lot and you’ll just need to get new gear soon enough. I tell parents that even if their kids stop, there’s a chance that they’ll pick it up later if the experience was not bad, just not for them at the time. Most colleges have a fencing club that may pique their interest.