This is an interesting thing to think about. While I did write Branch and Poppy as babies at the same time in my AU oneshot, I don’t feel this is as true to canon as my other theories regarding not only their ages, but the other siblings’ ages as well.
I like to think of Broppy’s age difference to be how it is in real life for their voice actors. Justin Timberlake and Anna Kendrick are four years apart in age, which sounds like a fairly reasonable age gap between Branch and Poppy. I think the flashback scene we see take place in the beginning of Trolls Band Together happens before the birth of Poppy. My guesstimate is that Branch is about three years old.
Keeping this in mind, I’ll move on to the brothers, who appear to be teens at that time. My personal default age when I think of a teen is 16, which is the age I place John Dory at. From there, I think each brother is about a year apart from each other, making Spruce 15, Clay 14, and Floyd 13. Floyd therefore is 10 years older than Branch, Clay 11, Spruce 12, and John Dory 13.
To guess their current ages when they are older, I’m going to go back and analyze Poppy’s age first, as she is likely the closest age to be confirmed due to it being stated that the Bergen escape happened 20 years prior (where Poppy looks to be a baby of 1 years old). If this is the case, it would make Poppy 21 years of age in the first Trolls movie. Branch, with my theory of him being 4 years older than Poppy, would be 25.
Now, seeing as one holiday season passes (Trolls Holiday) and another (Trolls Holiday in Harmony), my guess is that at least one year has passed for the duration of the events of Trolls to the events of Trolls Band Together. We know Trolls World Tour and Trolls Band Together’s time is separated by only one month, as Tiny Diamond was born in the second part and was confirmed to be that age. This would make Poppy 22 years of age, and Branch 26 years of age in Trolls Band Together.
In correlation to my theory, this would in turn make Floyd 36 years of age, Clay 37 years of age, Bruce 38 years of age, and John Dory 39 years of age.
Lastly, there’s Viva, whose age I think maybe a little trickier to pinpoint (for me at least). At first, I thought maybe she was Clay’s age, but when I considered the 14-year age gap between her and Poppy, I didn’t think it fit. I like to think she has at least a few years on Branch, but is still younger than Floyd, putting her anywhere between 27 - 35 years of age.
In the escape from the Troll Tree, Poppy looked to be 1 years old, making Branch around 5, and Viva anywhere from 6 - 14 (Although, I am more inclined to believe she was at least 10 years of age and up, since she - as it was told in Clay’s explanation of her backstory - was capable of fighting off the Bergens right before she and the other escaped Trolls were eaten).
In conclusion, here’s how I think it was when they younger vs when they were older:
Beginning of Trolls Band TogetherPoppy = Unborn (-1)Branch = 3Viva = 4 - 12Floyd = 13Clay = 14Spruce = 15John Dory = 16
Events of Trolls Band Together and afterPoppy = 22Branch = 26Viva = 27 - 35Floyd = 36Clay = 37Bruce = 38John Dory = 39
