Question: The expert mentor to the celebrities that perform on "Splash!" won the 2009 FINA World Championionship in the individual event at what age? 
Sentence (from "Tom Daley"): Tom Daley specialises in the 10-metre platform event and is a double World champion in the event; he won the 2009 FINA World Championionship in the individual event at the age of 15, before regaining it in 2017.
Relevant evidence: Yes