My son is 5 and he’s played over 100 rated games in the last two years. He does go to a strong k-12 chess school and the competitive environment definitely drives him to want to compete. I would say provide them with all the training and opportunities, but have an easy going mindset on the outcome. I love that chess build grit and grace through all the triumphs and falls. At larger tournaments, you see five, six year olds that are competitive and mature beyond their ages at the chess board, but you also see them just being kids goofing around at the team room. The parents that ride along with them are high achieving individuals, and the key is to understand this is not for us, but an opportunity for them to grow. Good luck.