I bought these for my nephew (3 1/2 years) to add to the basic Gears Gears Gears set I bought him last year. My son had these when he was younger and used them for years - they really grew with him and the adults that played with the Gears with my son, and now my nephew, equally enjoyed playing with them. It is a great open-ended toy and they hold up really well. I highly recommend this to everyone - both boys and girls - for play over many years from at least 3 years to 12 years for the motorized kits and such.