I have a question if Hiccup is 19 in race to the edge how old is dagur?
Unfortunately we have no idea how old Dagur is in any part of HTTYD canon, so we have no idea. Given his more mature body shape (compared to Hiccup and co.) in the Riders of Berk and Defenders of Berk series, it appears to me that Dagur is a few years older than them. How much older than them can only be up to our speculation.
The closest we can get to trying to pinpoint how much older Dagur is than the others is through Heather’s brief flashback in “Have Dragons Will Travel Part 2.” There, Heather seems to be a little more than a toddler - perhaps five years old - old enough to be having her first memories. We see a little bit of Dagur’s body shape in the memory flashback.
This shows that Dagur is older than Hiccup, Heather, and the other characters who all seem to be about the same age. The question is: how much older?
The body shape we see of him in “Have Dragons Will Travel” can be compared to other characters for us to try to gauge his age. The best body shape comparison to look at is Gustav. We see how Gustav looks when he is both twelve/thirteen years old and sixteen years old, so it gives us a fair comparison of what Dagur might have looked like younger at these specific ages.
So, for starters, check out how the kid looks in “The Flight Stuff.”
And this is how he looks in “Gone Gustav Gone.”
Gustav is twelve years old in Riders of Berk; Art Brown and Douglas Sloan have made this comment themselves (or so I’ve heard, anyway). He would probably almost be thirteen because RTTE is about three years after HTTYD, and Gustav is also canonically said to be sixteen in the episode “Gone Gustav Gone.”
Now, here’s why Gustav is the best comparison for how Dagur would have looked like younger: Gustav’s sixteen year old self and Dagur in Heather’s memory flashback are based on fairly similar models. Check it out.
We have obviously the same boots, the same tunic color, the same pants color, and the overall same lanky body shape. Dagur is wearing a long sleeve shirt while Gustav is wearing a short sleeve shirt, Gustav has knee protection, and their belts might be a little different. But they’re still modeled fairly similarly after one another.
I wouldn’t say that Dagur is sixteen in the flashback simply because his body is similar to sixteen year old Gustav, though. It’s to note that Dagur has always seemed to be a little buff and large for his age. Gustav, meanwhile, seems a bit small for his age. And, even more importantly, when we meet Dagur in ROB and DOB, he’s young enough to still be growing.
There is a huge maturity difference in his appearance between Riders of Berk and Race to the Edge, despite the seasons being only three years apart… suggesting he’s young enough to be going through such physical development still. Sure, there is something to be said about bulking up changing his physique, but it’s not just his arms and chest size. It’s the broadening of his chin, the growth of his nose and eyebrows, and other elements that make him obviously older.
My personal headcanon for Dagur’s age in the past, before I made this analysis post, was about three years older than Hiccup and Heather. That’d put Dagur at about nineteen in Riders and Defenders of Berk and twenty-two in Race to the Edge. But that’s just my own speculation. I think those numbers make a lot of logical sense… any older in ROB, and it could start feeling odd.
Upon looking at the flashback picture, though, it might not be too bad an idea to add one or two more years to my guesstimate: if Heather is 5, then by my old age gap headcanon, Dagur would be about eight or nine years old. That body shape is definitely not the body shape of an eight year old, though. Especially not when we compare him to how he looks next to Gustav at older ages. I’d be more likely to put flashback!Dagur in the 10-13 year old range. (Pushing the age up a little also explains why he would have the mental state to do something like ditch his sister in the ocean). 10-13 wouldn’t be toooooo odd for someone who seems to have good physical development early like Dagur.
So, if Dagur is around ten years old in the flashback, that would make him about four and a half or five years older than Heather - not an odd gap range for siblings at all. That would make him barely twenty in ROB and twenty-three or twenty-four in RTTE. Still not too bad. Now, if we put him at thirteen years old in the flashback scene, then he would be about twenty-three in ROB (I say that’s too old) and twenty-seven in RTTE.
So maybe it wouldn’t be the worst idea to suggest that Dagur is about four-ish years Hiccup and Heather’s senior? It would put him juuuust at the end or outside of teenaged years in Riders of Berk… any older than that, and I think that would be odd. Early to barely-mid-twenties in RTTE seems like a fair estimate for that time period, too.
Conclusively, I’d estimate that Dagur is somewhere in the twenty-two to twenty-four years old age range when Hiccup is nineteen in Race to the Edge.
But those are all personal estimates and nothing canon.