When I adopted Beans and asked how old she was the guy said "About a year and half". He didn't know. So I backed up the time frame to select a day as her "birthday" and picked January 9. So for Beans' "birthday" she got a new catnip filled banana. I kept it stored outside in a compartment until that morning. She was still in bed when I brought it in and set it on the counter. Instantly her nose started twitching, she jumped down, sniffed around, looked up then jumped up on the counter.
It took less than a minuet. It was uncanny.
I cut it loose from the board and the fun began.
I'm not comfortable with her birthday date and have decided to treat the day I adopted her as her birthday from now on. She'll be getting a new banana April 9th.