I am not too sure exactly, but I think Venus and Serena both started playing tennis at an academy aged 10 years old, but whether that means they actually knew how to play tennis then, or not.
Sorry you'll have to double check again.
Hope I helped!
Venus Williams is an American tennis player
tennis
Venus William started playing tennis when she was 4. She became pro at 14.
Venus Williams job was a tennis player
Venus Williams did and still does play tennis.
Venus Williams has written: 'How to play tennis' -- subject(s): Tennis 'Come to Win'
tennis
tennis
Her father bought the sisters tennis equipment at a young age and encouraged them to be champions
Venus Williams
Serena Williams and Venus Williams
because they are famous tennis players