The wisdom of age is having a moment. A creaky, taped-up, this'll-hurt-in-the-morning moment, but still.
Last week, Helio Castroneves won the Indy 500 at age 46. Last month, Phil Mickelson won the PGA Championship at age 50. Earlier this year, Tom Brady won the Super Bowl at age 43. Last fall, Sue Bird won her fourth WNBA title just days before turning 40.
Now here comes Serena Williams, 39 years old, twice the age of many of her contemporaries, firing her way into the round of 16 at the French Open.