Suppose Serena Williams is a professional tennis player who has won 23 Grand Slam singles titles, the most by any player in the Open Era. She is also an Olympic gold medalist and has been ranked world No. 1 by the Women's Tennis Association eight times. Serena was taught how to play tennis by her father, Richard Williams, starting at the age of four.
Can we infer that "Serena Williams started playing tennis professionally before the age of ten."? Yes, no, or maybe?