My cat uses them... I got them for him when he was about 3 years old and took to them with no problem. I've been told it's a 50/50 gamble in using them, some cats hate them... some don't mind. It doesn't matter if they are young or not.
They definitely save your furniture! The only downside is I bought him a huge cat scratching tree & now he cant use it. He still tries to sharpen his claws... kinda funny to watch.
Definitely get the clear kind... too many people would look at my cat when I used to buy the blue ones and ask if I painted his nails, like it was cruel or inhumane.
