jelly,
JG is quite strict on the 18 mth rule for playclub. Minibee is already 18 mos so she's in playclub. As for regina, i made a request and the playnest teacher had to write a recommendation for her to go to playclub which is subjected to approval. Regina was lucky that it got approved so that's why she's now in playclub.
difference between nest and club is in club there's more learning involved. They are introduced to letters, numbers, shapes, etc. In nest, it's more nurturing and getting the kids to be familiar with routines, etc.