Okay, people change all the time.
School back-benchers turn around, finish college with top scores, get jobs or start businesses and lead mature, responsible lives.
Introverts move out of their shyness and make friends.
Stammerers get over their difficulties and become great speakers.
Alcoholics stop drinking and become mature.
Criminals convert to religion and leave the life of crime behind.
Lazy and selfish people become altruistic and devote their lives to the service of others.
Sinners become saints.
Traders who cannot see beyond an hour become investors (rare, but still) who see beyond years.