used it 2 days when he was 7, then skied the rest of the week. Used it last year 1 day (8). But he's too big for it now, so he's actually riding a 126cm now and doesn't want to ski anymore. Here's a pic of him with the 126.
it's more height and weight than age. Brandon is big for his age, he weighs 105. If they're over 90lbs it's probably too small, plus if they're beginners short would be better. I worked at a bike/snowboard shop for 10+ years so I know how to size boards...kides are trickier to size though, I wanna make sure it's the right size for the rider. Worst case scenario I'll sell it next fall.