my grandson is 7 and the one we bought for them 2 years ago is waaay to small now, so wife wants to get him something bigger and I hope something that has enough ergonomics so he doesn’t outgrow it too quickly. that’s probably not possible as I suspect he’s taller / heavier than average cause he comes from a family where everyone (but the women) are 6’ 2" and up.
bigger and inflatable wheels / tires and a handbrake are musts…lots of hills here and they go into dirt paths all the time.