My grandson is only 2yrs and nearly 6 months, I started him on standard lego at 18months and he can't get enough of it playing daily doing his own thing. I stepped him up to technic 6 months ago with a pull motor and his interest soared. Ok he cant follow the harder instructions yet but hes ok with city etc. I spent time with him though making the sorting and finding of bricks into a game with chocolate button rewards he does it matter of factly now. This christmas I went well overboard getting him 2 big sets from 2016 a pneumatic excavator and the artic Explorer sets. Weve had them built and pulled apart twice already and now he's started building his own basic motor and mechanical pieces with the help of 2 of Isogawas books on kindle. Its not just lego, he can go online and get onto youtube to find videos etc without assistance on both my pad and phone. Just keep playing along with him. As he'll learn from watching you as well. I may well have a genious on my hands as he can count to fifty, recite the alphabet forward and back, almost tell the time, and use all the technology in my house better than me. So im stepping him up to EV3 on his 3rd birthday. Im learning as much about this as he his.... just play and have fun together and get him sorting into seperate pots/trays and drawers.