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Kaka started playing for Brazil in 2002.
he started playing football at the age of 4 because he got a football for Christmas and never stopped playing with it
He started playing football on a team in seventh grade, but he was playing football in the backyard by the time he was 3.
He started playing footy in 1999.
neymar started playing football at the age of 3
We have no idea who "he" is in your question.
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he started playing in 2007 in Nashville NC
Peyton Manning started playing football when he was in High School.
Yes, you can say that you have started playing football since you were young, but it would be more grammatically correct to say, "I have been playing football since I was young." This phrasing emphasizes the ongoing nature of your involvement in the sport.
AJ Green of the Cincinnati Bengals started playing football when he was in High School. He played football at Summerville High School in Summerville, South Carolina. He would have been approximately 14 years old when he started playing.