Actually I think when it comes to dragons, there are two different kind of maturing process. The physical and the psychic/mental one. The body of a dragon can grow due to greed. The mind doesn’t compare this. Most dragons react pretty aggressiv, because they are literally unmature inside. Yes, there are steps to become an adult. Wings for example. Spike was a preteen and will become a full teenager as Smolder (and maybe even Ember) is. Yeah, Ember seems to be a little more older and that could mean 5 years, or 500… Who knows? It’s pretty obvious that dragons don’t age the same way ponies do. Otherwise the 100-years nap would make any sense. But it’s MLP, a show with very different writers, so… Again some kind of discontinuity?
 
I think after the “teenage” years of a dragon the bodyshape it’s just a matter of greed. The greedier the bigger. Ember’s father Torch must be the most greediest dragon of this age. :-D

@Violet Rose in The Rain  

 
I mean, Spike shot from child to adult in less than a day due to greed.

@ABronyAccount  
That’s kinda how I pictured it with him and Smolder being around Dipper and Mabel’s age and Ember, Garble, and the other teen dragons being around the same age as Wendy and her friends.

More like 15 when the series starts, and he’s mentally more mature than that when he’s not being used as a Chaos Magnet.

@Background Pony #74A8  
Nah, Twilight is just humoring her baby dragon antics.

@Background Pony #E849  
The dragon from Dragonshy was about to take a hundred-year nap.
 
Not really relevant or anything, I just don’t think dragons could feasibly grow from a child to teenager in about a hundred years of sleep.

If Ember is a around a hundred, shouldn’t she be the size of a building like Torch or that dragon from Dragonshy?

@ABronyAccount  

 
I’m getting the “She’s actually a 900 year old dragon in a loli body” vibes, and it’s making me uncomfortable.

Cue “thirteen, technically a teenager” a la Dipper Pines.

Terrible and also hilarious
 
Terriblarious
 
Hilarrible

Well, I agree with the fact, that Ember is the oldest one of the trio. Than Smolder (’cause she got wings) and Spike at last. However, it’s quite difficult to get the really age in years, that’s true.

The three of them came off to me as teens to be quite honest, with Ember being a slightly older teen.

@Edhelistar  
And Twilight

@QueenCold  
Not at all. Anime girls are good looking.

@Background Pony #6993  

 
Does he look like an anime girl?
 
Well… kinda.

But we don’t know how old Ember is; Spike could be far older than her for all we know. Headcanons . . . geezes.

Ah, come on! It’s only because his puberty hormones are twisting. :-D

@Violet Rose in The Rain  
The only one shipping Sparity in canon, is Spike.

@Background Pony #BC24  

 
Doesn’t stop rubes from shipping Sparity, still.

These girls have the right idea that every other character should have about Spike.

Given what Ember said, definitely Spike and Ember.

Given what Ember said, definitely Spike and Ember.

Oh so Ember is into /SS/ then?