@SimHallgerd It's too bad that Sims 4 doesn't have the same flexibility built in that Sims 3 does, where you could set the length of each life stage to what you wanted, within a large range, independently of the other lengths, simply by moving a slider within the game options; or tweak it even further by editing options.ini. (I've seen people using the 900+ day Epic lifespan overall but with a 2 day baby stage, for what are probably obvious reasons.) I agree that it would suit a lot of people's gameplay better to have longer young adult and adult stages, but even more so, allowing customization would make everyone happy. I still play Sims 3, and I use different custom life stage lengths for each type of save.
At one point in Sims 3, I remember seeing a dialog saying to get the most out of family play, it was "recommended" that people extend the child and teen age stages to the maximum, or something like that. (I don't remember the exact words, or where I saw it; maybe in Lessons.) Maybe the Sims 4 developers had a similar idea, that the child and teen, and maybe toddler age stages, were so rich that they should be longer relative to the others to allow players to fully enjoy the features. But that doesn't mean that everyone wants to play like that.
On the other hand, there's nothing to say that sims have to age like humans do. They might look human (sort of), but they're their own separate imaginary species with their own made-up rules.
