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I feel like DS8 year old would have easily passed the marshmallow test, as he has no impulse issues, but he is like an absent minded professor. He may very well try to put his underwear on over his pants, forgets to take his backpack when leaving the house,

My DS7 is like this. Compared to other 7yo boys I know he seems unnaturally high in impulse control, like a much older child, but he leaves his stuff everywhere, puts his shirts on backwards (then laughs heartily upon discovery), and will do things like get into the showe in his underpants. At the time, he completes multistep processes much better than his sister did at this age. I kind of think he just isn't very focused on the mundane?