Which group is most likely to suffer spinal cord injuries? men 19-44 men 45-90 women 19-44 young children under the age of three

What are the options?

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)