Correction part I
When I was 15 years old, I had three very lovely kittens in my house. They were like my only friends. I spent all of my free time looking after them attentively. Since they were born until they were 4 months old, not a day went by without seeing their faces or hearing their voices, and I loved them so much.
I'm not a teacher, nor a native English speaker. I'm just trying to help....Any other comments are welcome!