Yes. Yes they should. And about that, although it's true that horses/ponies generally only live for up to 30 years, it's clear that this show doesn't follow that kind of aging, and has them age more like humans than real life horses/ponies. The mane six have been stated to be in their late teens or early 20s, and they look it and act it. With that considered, it's unknown how fast dragons age exactly, even if their lifespan can be 1,000 years or more. It seems to be a common belief that they age slower because of their long lifespan, but I've also read that there can be different ways in which they can grow/age faster, and that it also largely depends on how they were raised. We can see implied proof of this in Dragon Quest and Gauntlet of Fire by some of the bigger dragons. Granted, we don't know how long they've been around, but still. It's also a known fact that the lifespan can depend on the species, and some species grow slower and sometimes even only reach a certain size, but it doesn't always mean the aging process is slowed down too. To further that point, some of the dragons in Gauntlet of Fire that were considered adults weren't all that much bigger than Spike. Although, we still don't know much for sure about how dragons grow/age, especially in this show, but I'm sticking to the forementioned stuff that I've heard and seen so far.



Seeing as how that point is backed up by what you said before, I'm just going to apply what I said before to that as well. With all of that considered, he may have one sooner than you may think. As for that, many people like to think of Spike as being a child because he has a childlike appearance and some childlike behaviors. But Twilight was only a filly when she hatched him, so I think of him as being a young teen at the very youngest because of that, and the reasons I gave before regarding the growth/age. Not to mention, even teenagers and young adults can often act very childish or at least have childlike behaviors. Besides, I think Spike has been developing/maturing mentally in recent episodes. I personally think of it as more like a young teen with a crush on a slightly or moderately older girl than an 11 year old with a crush on their teacher.





You don't have to care for it, but I still stand by my reasoning. There's no solid evidence of anything yet.