CREATE TABLE table_23299 ("#" FLOAT, "Player" TEXT, "Age" FLOAT, "Australian Open" FLOAT, "French Open" FLOAT, "Wimbledon" FLOAT, "US Open" FLOAT)

At what age did Roy Emerson complete the Grand Slam?
SELECT MAX("Age") FROM table_23299 WHERE "Player" = 'Roy Emerson'
SELECT MAX("Age") FROM "table_23299" WHERE "Player" = 'Roy Emerson'