Well, it’s tricky, Thalyssra was after all of the same genetic stock as the Highborne Night Elves, and they were immortal until Archimonde came to Azeroth the first time and destroyed the World tree, at which point all Elves started aging again.
We know all Elves live for ‘several’ thousand years (all types) apart from Void Elves, we have no idea if they do, as the lore source on Elven ageing was printed before they were introduced. It was before Nightborne were introduced as well, but they’re essentially Kaldorei.
So while Thalyssra has been in existence for longer than Lor’themar, we have no idea how old she was when she became immortal for 10,000 years, similar to Tyrande and Malfurion.
Tricky, That is his natural hair colour, as can be seen in the ‘Blood of the Highborne’ novella (Where we also learn that his natural eye colour is brown), and it does seem to be a natural hair colour for Elves, and doesn’t necessarily mean he is old, you actually get that in real life, and not just in Albino’s, but in people who have naturally Ash-blonde hair. My hair was Lor’themar’s colour when I was born, and stayed that way till about 17, when it went proper golden, and then when I hit 40 it has darkened, to a kind of brown. Whilst my head hair has no ageing signs, when I grow a beard or moustache it has white hairs amidst the ginger (Don’t ask why my beard is ginger but my head hair is brown, I have no idea!)
As to the way he talks, I talk that way, and I’m middle aged, not old. He just has a refined way of talking, is all, well, when he’s not being a snark beast, anyway.
He is definitely older than Vereesa, He was already a Ranger-Lord, at the time of the Dark Portal, whereas Vereesa was too young to fight in the Second War.
As for looking tired, well, yeah, He’s had to handle the betrayal of a close friend (Dark’han Drathir) which led to the death of 90% of his species, then the betrayal of his Prince, then having to lead the Sin’dorei through their darkest hour, and he doesn’t even want to lead them, but they want him to. He has lived a life of duty and betrayal, and now has the stresses of ruling an entire nation weighing on him. You can tell from his and Thalyssra’s short story that he never stops stressing about his rule, and the state of the Horde, until one of his advisors, Rommath says “Just take some time off, go do something for yourself for once!” which does kind of imply that the poor chap works himself into the ground for his people.
Hmm, He had -reigned- for 3,000 years, unless he was crowned King upon his birth it seems highly likely he was older than that, besides, Alleria fought in the Troll Wars which ended 2,800 years ago, and she still seems perfectly spritely.
Ehh, nah. Reddit ain’t right on that front. High and Blood Elves reach maturity at, at most 20 years old (Source is ‘Edge of Night’ Sylvanas is already a Farstrider at that age), and they don’t become old at that age, as I say, Alleria is still spritely and she is at least 2,770 years old, and thats assuming she was 20 when that War was happening.
This said, if I had to age them in human terms, I’d probably agree with what some say here, he probably is in his relative mid forties, and Thalyssra, now that she is not immortal anymore is probably in her mid-to late 30’s, putting them both above 1,000 actual years old.