Many people assume that heaven would allow them to be in their youthful form. But, it is many people's youthful form that caused their sinful nature. Youthfulness is not the only possible cause. It, also, could be ability, atmosphere, etc. This could be a final test, for many. You could be put in the same situations, to see if you still allow it to cause sin. This would test your true loyalty to God. Would God say, 'Welcome, my good and faithful servant.' Or, would he say, 'You will deny me three times, before the cock crows.' Unlearn.