Yeah its normal but OP created age limits which OP I think want to know what age depression hits human will for me I think I remember age 14 because that the time I cant handle bullies and I want it to stop lucky for me I have my teachers.
As a person and student who study hard I cant stop depression but not that much. So as student we need to study and graduate so I cant just sit and dont get worried for my grades. Depression in studying and less sleep when its exam day, so yes we cant stop depression but its up to that person on how will he get his life with no depression.
Plus this one user right here had gotten my attention his totally right
Plus if you are parent you will definitely get but I already seen how to be a parent.