Glad that yours is holding up so long. I bought a R2 around that time and keep the chassis barely 2 years. Some designer thought it was a great idea to put a single vent GPU 1cm above the HDD, resulting in regular overheating of the GPU. I extracted all the components and moved them to a new chassis. It died 4 years ago.
Your focusshould be on something that catches his interest. Depending on the child I’d say choose stuff that is easily to learn but has some depth too it. If you want to invest some time do some projects with him, to give easy goals to achieve and continue. Be the rabbit hole.