Billy Joel's wife is Alexis Roderick. As of now, she is 43 years old. She was born around 1982, and she married Billy Joel in 2015 when she was 33. The couple met in 2009 and have two daughters together. Alexis Roderick is a former Wall Street businesswoman and equestrian. She is significantly younger than Billy Joel, who is currently 76 years old. So, Alexis Roderick's age is approximately 43 years old.