This younger man believed in Christ, but as he became more mature and found spiritual nourishment in alcohol, marijuana, criminality and meth, he became quite the demon.
Can a person like that eventually redeem himself with a real reaffirmation of his faith? Sure.
Is someone like that equally as secure with their place in heaven as they were when younger after all their criminality without genuine repentance? That is up to God, but I do not think there will be some completely free pass unless the sinner themselves make steps in the right direction that are sincere.
The bible describes people who call out the name Jesus but he says depart, I never knew you. Only God knows if he was ever saved.
Our time on earth is short and our purpose here is to store up treasure in heaven. Even if he is saved, how would you like to live an eternity in heaven and always remember what you did with the greatest gift ever given?