No one ever changes. Peoples personalities do not change much from childhood. If you were a dick when you were a kid then you will be a dick when you are older. If you were pleasant when you were a kid then you will be pleasant when you are older. I have observed that most of my friends that i have known since early childhood (7 years +) have the same core personality traits. People correctly predicted which of my friends would go to prison based on how they acted as a kid. Toddlers act how they are gonna act for the rest of their lives. If they are terrible when they are 4 then they will be terrible when they are 44.
You might have managed to grow out of the crippling shyness you had as a kid but that doesn’t really count. I’m talking about going from a horrible, spoiled, lying, thieving mischievous kid to a calm cool pleasant dude. That does not happen. Ever. Dennis the Menace is going to end up being a douche bag ex con. That’s just him. He will not change.
I picked up a part time job at a toll booth (job sucks) while i am waiting for my board results. I encounter hundreds of people a day. Some are super cool, and some are dick holes. I am willing to bet that the dicks were dicks ever since pre-k, and the cool people were cool ever since pre-k. God I hope my kid isn’t a dick.