Originally Posted by Geckoflora

I'm not the greatest at identifying species but it looks like it might be a merauke to me?

Try posting pics here, there are some more experienced people who could probably ID it:
http://bluetongueskinks.net/

It's pretty much impossible (as far as I'm aware) to guess the age of an adult skinks, especially just from pictures. But maybe some more experienced skink keepers could guess for you.

He does look fairly healthy from the pictures, but they aren't the greatest quality pics and don't show everything. If you look at him in person, make sure to check around the eyes/nose/mouth especially like for any signs of mouth rot or respiratory infection. Also check the body to make sure there aren't any strange looking spots, mites, or bad stuck shed. Body condition looks good from the pics but that's all I can really tell.

Good luck!