Sadly, no physics and collisions yet. But hey, look! A thousand scenes! /s
Well, it might be difficult then to explain it but I'll give it a go.
- Adult characters age at a normal rate.
- Not the same for children (created or born in game), they will age depending on the value of the setting "Child Growth Speed". If that value is 1, then the child grows normally. If the value is 360 then the child grows 1 year per in game day.
- The MIN value in the file age.lpstat serves two purposes: 1) at what age the characters become interactable and 2) minimum age for characters generated randomly in the game.
Up until this point, if you merely want young people, you can set age.lpstat MIN to whatever floats your boat, "Child growth speed" to 1, and play the game. You'll find characters of that age*.
Now, the confusion stems from the fact that, while most would expect the game to age the character from newborn to MIN in age.lpstat at the "Child Growth Speed" value and then grow normally (i.e. treat that age as adults), the game doesn't do that. The game continues to age them up until they are 18 at "Child Grow speed" value, and then normally. It is hardcoded that way.
What my fellow posters meant is: there's no reliable way to expedite the age from 0 to MIN value of age.lpstat. You could change "Child Growth Speed" to 360, let x days pass, and then change back to 1 to make a character reach x age, but that would affect other under 18s too.
The other option would be to create a mod to set the age of a specific character.
Sorry for the long post.
*And they won't look that age, so don't get your hopes up.