What do you think about Lotor's age? Is he "immortal" because of quintessence exposure and that's why he's still alive even after 10,000 years? Or was he in a cryopod like Allura and Coran? Or you have a theory of your own to explain that?
I think Lotor was in a cryopod because he’s clearly not viewed as eternal the way that Zarkon and Haggar are- Throk calls him a “brat” and clearly seems to believe that he’s been fighting with the empire longer than Lotor’s been alive. Also, while Zarkon and Haggar clearly look like older adults in their immortality, Lotor still looks like a young teenager.
It also would make a lot of sense if Lotor, like Allura, took the quick path to the future, because a lot of Lotor’s strongly-held ideals basically hearken back to how things were before the war, ten thousand years ago.
Allura also reacts to the revelation that Zarkon has a son with “this is… disturbing”, in a way that suggests she has more reason to be uncomfortable with the topic than just the fact that somebody had to have Zarkon as a dad.