Im pretty sure their lifespan is pretty long, but they usually die of other causes..
Anyway yeah, about 60 sounds right. But you could just as well say he's 25, it's not like the grow slowly. Their growth is at the same pace as humans, it's just that they age slower. They are pretty much the same for the first 20 or so years, then they stay the same. Until their 60's, they still look 20, then they age a bit, and more and more.
Im sure their average age is more than 250, roughly double. But that's just what I think, Im not 100% sure.
As for the name, you can use a TES name generator, online.