When do children get there first molars and second molars?

The first molars that children get are called "pre-molars" and they come through at around 24 months of age. They are baby teeth and will eventually fall out to be replaced by adult teeth. The first 'adult' molars come through at around 6years of age, the next lot at about 12yrs & the last lot (if they make it past the gum line) are the wisdom teeth which come between the ages of 17 - 21 generally.

For a 3D model & a good stage by stage description please refer to the related link.