I only have one DS who is 5 so can't compare.....
He makes noise which is either singing or really really loud talking all of the time that he isn't watching a film. He doesn't know that he is talking too loud ever. I find it really draining as there isn't either an off switch or a volume switch!
Is this what NT 5.10 year olds do? He has dyspraxia and SPD but also looking at an ASD potentially due to other traits.