Answer:
They come at night without being called and are lost in the day without being stolen. What are they?
I am a sound made by felines when petted.
There was a girl half my age when I was 12, now I am 66, how old is she?
If you're looking for something sweet I know what to do. But if you don't like heat I'm not for you.
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down, but should not be forgotten. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.