Knowing my taste for enigmas, she said :
"The product of their ages is 36, and the sum of their ages is equal to the number of the neighbours' house...", pointing to the house on the other side of the road through the window.

As I was still hesitating, she added :
"Ah, I forgot to tell you, I'm used to always give my cats a little something special on their birthday. The one with the biggest number of years got a 3 lb. slice of veal liver this year, and I'm still hesitating between chicken and lamb for each of the others..."