there are no conditions that would survive from an evolutionary perspective that severely disabled young people before having children.
you should not be hearing about young adults and teenagers having strokes and heart attacks.
Discussion
and taking this one step further. there should be no diseases that severely disable adults raising children since humans have such a prolonged "childhood" compared to other species.
the adults that have disabling diseases would have died off and failed to raise capable children that would never have created thriving tribes of other humans