I have this genuine question

What kind of bodies would be attained in heaven, if a boy of 10yrs dies and goes to heaven would he retain that 10year old body for all eternity or be given a new body of a 30yr? old man.

If an old woman of 90 dies and goes to heaven would she have a new body of a 40yrs old lady or retain that 90yrs body.

You should refer this question to experts on physical spiritual bodies -

https://www.nairaland.com/nigeria/topic-429593.0.html

We will have adult bodies . Just like Adam There are no children in heaven. We will be like angels .

Like a dream you are anything you want in Heaven. if you have a big head this is the time to dream for it to be smaller in your heaven so that people don't laugh at you. If you are a baby it is time to dream to grow up, if you body parts are sagging, it is time to lust for youth.

Deep Sight:

You should refer this question to experts on physical spiritual bodies -

https://www.nairaland.com/nigeria/topic-429593.0.html

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Not sure about the expertise tag but you'll surely glean a thing or two if not an avalanche or more from the link

If you have bad teeth God will straight them for you in heaven, it is every christians dream come true. but it is just a dream it is not real.

what body structure do you have in your nightly dreams? that is what you will look like in heaven. your nightly dreams are temporary journeys into the heavenly or inner spiritual planes.
when you die physically your dream world now becomes real and no longer just a dream and you continue your existence there.