One would think that would be the case but in reality what happens (I've played with and without) is that since they age slower you get a larger population built up before the first death knell so it ends up being a smaller percentage of your total population which makes it easier to manage. Since they age slower there aren't bodies needing to be transported as often as with the default age length.
This statistically makes perfect sense.
If people live only 6 years, then one sixth (about 16.67%) of the population will die each year. If people live 80 years, then one eightieth (about 1.25%) population will die each year.
So in a city of 100,000 inhabitants there will be :
- 45 deaths per day if people live 6 years
- 3 deaths per day if people live 80 years
Even though 80 years is clearly too long (mainly because of game dynamics of social evolution and education), I do believe that 6 years is actually very short. Even for schooling, I have often the feeling that we get nearly instantly educated people when plopping an elementary school. Granted it takes a bit longer for high school and university, but still, I do have the feeling people progress very fast.
As a result, I would say that a neighbourhood would reach full maturity in 3 years or so, which is very short. And as a result we don't necessarily feel newer districts really newer than older ones. I don't know if others have that feeling or if it's only about my own way of playing.