Well, Miko is ancient. Like, millions/billions of years ancient.
Boldur is really really old, but I’m not sure we know if that’s thousands of years old, tens of thousands, hundreds of thousands…
Ambra is about 11,000 years old.
Rath is unclear, but is at least 1,400 years old (my guess is between 1,400 and 2,000).
Deande is about 1,000 years old
Caldarius is at least several hundred years old, perhaps more.
Galilea is at least 600 years old, probably more.
Thorn is at least 125 years old, I get the sense around 150 years old.
Mellka is around 90 to 100 years old.
How old is Kelvin? I have none of his lore done. I got the sense in terms of sentience, pretty young.