I know all cats are different but generally speaking, around when do kitties start to "enjoy" catnip? I bought the girls some catnip stuffed toys the other day (more because they're cute and have bells on the end of their tails than for the catnip) and the girls will occasionally play with them but that's about it. FYI Rosalie is 7 months old and Zoey's 5.5 months. Our old cat, Alizea, started to 'feel the effects" of nip around 6 months old.