The first LEGO brick were born in Denmark over 50 years ago. Regular bricks are at least 8 mm wide, 8 mm deep and 9 mm thick and suitable for age 4 and up. DUPLO and QUATRO are double and quadruple in size and suitable for age 1 and up. LEGO System is an open-ended building system that lets you create anything you can imagine, age 4 and up. LEGO Technic was developed so inventive builders could create even cooler models that moves, age 8 and up.