Conquest of the Horde

Could someone please tell me the Dwarven ages? I've read the entire Dwarven Lore wiki and found absolutely nothing and I'm absolutely lost on how old my Dwarven character, Thagnar should be.

Take a gander at these guides. This one in particular.

Dwarves live roughly for about 500 years!

A dwarf can live to be about 252-450. They reach biological maturity at 18, like all other races. Note that I said biological. Culture could/would still deem them a child.

Culturally a Dwarf comes of age around age 40 to 50.

Welp! I sure been doing this wrong :I