How old does a child need to be to play with our kits?

WARNING:  Choking HAZARD due to small loose pieces.  This kit is not intended for children under the age of 3.  Adult supervision is required.

Kits are appropriate for children ages 3 and up.  Our nine year old children spend hours with these kits.  We have received positive feedback from customers who gave kits to children as old as twelve years of age.