Short answer: Yes.
What works at this age: Everything except the fastest FontRun tiers. Typing practice starts to genuinely stick at seven, and the stories are readable solo.
What’s harder: Nothing structurally — just speed. The hardest FontRun and Typing tiers are built for the top of the age range.
What they’ll get out of it: Measurable typing progress, more fluent reading, and typography vocabulary — most seven-year-olds finish able to tell a serif from a sans and argue about which is better.
What to expect in the first week: Independent play from day one. Expect printed posters on the fridge and strong opinions about fonts you have never heard of.
Font Quest is a Mac & Windows desktop game — $14.99 once, no subscription, no account, no ads, and it works offline. If it isn’t a fit, there’s a 30-day refund, no questions asked.