my two boys are 16 months apart and we got a mountain buggy double Dj is 4.5 and Vic is 3 and we use it daily for our walk to the mail box and back (so about 1km round trip) the weight per side is 22kg so it'll be used for a long time yet. even with vic walking its still very handy to have for when he gets tired ect. little exxy but its something i cant go with out.