Cartoons in general feature characters that don't age, but in most of them, they're meant to be a setting where nobody ages. Ninjago, for some reason, doesn't feel like it has that kind of tone. There have been times when several months, or even a year, has passed between seasons. Therefore, I'm curious as to what the ninjas' actual ages are.
On a website separate from this one, I heard that one of the writers said that if you have elemental power, then you age slower than a normal human. This explains why the ninja never age during the course of the series. But let's look at a little more evidence.
First off, Lloyd. When he first showed up, he was probably around 10 or 12. But thanks to the magic tea in Season 2, he aged up to the unspecified age of Kai, Cole, and Jay. What kind of confuses me about him, though, is Harumi. In her backstory flashback, it shows that she was the same age as Lloyd (10-12, if not younger) at the time of the Great Devourer's rampage. Clearly a good number of years passed between them and Season 8, because by then, Harumi seems to have aged up to...whatever age Lloyd is currently. Based on that, how old were both Harumi and Lloyd?
Second off, the other ninjas. There's no problem with Zane, as he's a robot. And I know it was said several times that Nya is younger than Kai.
Third off, the things the ninjas say and do. Once in a while they say that they are teenagers, meaning they could be anywhere between 13 and 19. However, given that they are always driving jets, giant motorcycles, and 4X4 jeeps, they're probably on the older end of the spectrum. The other major indicator to me is that in Season 10, Jay's subplot is all about proposing to Nya. Of course, 18 and 19 would still technically be teenages, but the writers also said that what Jay did was supposed to be a promise ring rather than a full-on proposal.
With all this in mind, what do you guys think? How old do you think the ninja are supposed to be?