I noticed that after a certain size, around 30k population, my city's population growth rate declines a little without expanding residential zones. I then briefly looked around the houses in my residential districts and saw that a good number of homes had seniors as residents. This was around 20 years into the game from the start.

How long does it take for a person to grow up?

2 Answers 2


It takes about 2 years of game time for your first senior to appear in game. My first senior appeared after about 2 years of the first citizen moving in. I do not know if its is a variable amount but that's what I experienced while testing.


  • 1
    It would be interesting to figure out how long it takes a citizen to go from birth, through each school phase and then from adult to seniority. Commented Mar 13, 2015 at 13:38
  • Though the Senior could have just moved in or had done so as an adult and aged to a senior. I highly doubt when you start your city it is inhabited exclusively by 1 year olds.
    – Ryan
    Commented Apr 13, 2016 at 17:09

From Wiki

Citizens age very quickly in Cities: Skylines, with a typical lifespan of 6 in-game years.


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