I like to imagine that the reason why the warmer colors live shorter is because the healthcare they are given is so shitty that they die earlier compared to the cooler colors, who have better access to healthcare (due to being richer and more respected and whatnot).

Also drones are SO ignored in the comic. it's never explained where they came from before the Condense replaced them with robots after the Vast Glub -- which I imagine killed them too if she had to replace them. So I headcanon that if two trolls try to reproduce without the help of a mother grub, they get a haploid drone baby. and with the mother grub you get your standard troll. I think that would explain the similar sexual dimorphism traits trolls have like to humans, because why would Trolls look like that? unless if sexual dimorphism of troll is more of a vestigial trait. that would also be kind of interesting. That was my headcanon until i started wondering where tf drones came from rip. and that was my solution