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I'm a proud owner of that exact GSO 8" Dob you're after and yeah kids that age won't have any problem. When pointed straight up the eyepiece is 120cm above the ground; if both kids are over 130cm tall, no step required.
I'd highly recommend a red dot finder; the little GSO one at around $80 is superb and slots straight in place of the guidescope (I haven't used my guidescope since getting it). If the kids combine the RDF with a free smartphone app like Stellarium or Google Sky Map they'll have many hours of amazing viewing.
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