Took less than that for Sterling to get called up, and don't get me started on Zaha.
Arguably Kevin Davies only got his cap after one decent season for Bolton too.
Sterling and Zaha completely different cases to Lambert in that they have potentially 10+ years left of international football and the coaches probably wanted them to get a taste of what its like sooner rather than later. Wouldn't be at all surprised to see something similar to these 2 happen with Shaw
To say that Davies only had one good year at Bolton is very harsh on him aswell