I'd think it would work...but it might be a little on the big side. We have my nephew on a 109 motive.
He started on it at 5y/o. He's now 7 and about 55#'s. The board's looking a bit on the small side now for him so it's almost time to step up to the 119.
Overall, the motive has been a great learning board for him-
Awesome pics! Having kids on the boat enjoying the water makes it all worth it!
Here's my arbitrary proud uncle pic contribution-