Okay, so, it just happens that the person who claims to have painted these was in fifth grade at the time.
When I was 5th grade (Now 7th)
But if he never said that, I would be willing to bet there would be fewer accusations of thievery. Instead of being accusatory, it might be a better idea to be glad that he chose to give his age at all. Prejudice is a bad thing, and prejudice by age, I've found, is one of the most annoying types. We could all be better without it.
If, though, all the people accusing him of stealing these paintings are actually correct, then... So what? If they're stolen, then this is a desperate reputation call, and reputation doesn't really mean anything anyway. It may be best to remain silent so as to not sound paranoid if these paintings were created by VicBoy.
Of course, VicBoy, it would really be best if you acknowledged from the start that these were copied. It would have prevented all of this mess. Still, congratulations on these and keep at it.