Edgar Romero from world Rickey is a phenom who was 29 at the inception of the world. He is now 40 years old and has declined substantially, but in his prime went 50/50 four different seasons.
His first 7 seasons in a row he was at least 40/40. Missed it in S8 with only 37 HR, but went 50/50 in S9, at age 37.