Bro that shouldn't dictate how gravity affects a person lmao. A 20 year old weighing 120 pounds falling into a black hole would be no different from a 40 year old man at 180 pounds falling into a black hole. Gravity would still effect you both dramatically. It's not about strength lol
What? Black hole absorbs gravity. You're talking about gravity not a black hole right? Those two things have two separate functions.
In terms of mobility under intense gravity, then yes a well developed body will be able to provide a better resistance because you are exerting more muscles under that much weight better than a kid.
Ask yourself this question. If you hold a benchbar with 225lbs of weight on a 220 pound adult's back and a 170 pound 16 year old kid's back, who would be able to get up from their knees and start walking? The 16 year old or the adult?