I have watched my 4-year-old nephew since the day he was born. Also, I have watched my high school math teacher's kid who I watched since he was one and stopped when he was about 2.
Recently, I have watched my best friend's child while she had to work all day. She allowed me to watch him at her house but was allowed to take him out with me. He was about 1-1/2. I will continue to watch him when needed.
I have done late nights, have experience with diaper changing and putting a child to bed. I love to play with the kids, I am not one of those babysitters who just watches TV while the kid plays alone. I interact with the child and love to play games!