Alex Rodriguez turns 40 years old Monday. It’s rare enough that a 40-year-old is playing in the major leagues -- only eight others are -- but Rodriguez’s production this year is among the best in baseball history for someone his age.

ESPN Stats & Information takes a look at what the New York Yankees' third baseman has accomplished in 2015, notes his distance from various milestones and considers what over-40 players have done in baseball (and other sports).

For his age, one of the best seasons

The 2015 season is considered Rodriguez’s “age-39 season” (defined by a player’s age on June 30 of that season), and he has been remarkable.

According to OPS+, which measures a player’s overall offensive stat line relative to the league average, Rodriguez is having the fifth-best season of a player age 39 or older in the modern era (since 1900).

Despite being away from baseball in 2014, Rodriguez has rebounded with a bang, racking up 23 home runs to go along with a team-leading .375 on-base percentage.

Rodriguez’s three-homer game Saturday boosted his OPS to .914, which would give him the sixth-best mark for a player his age in the modern era. Barry Bonds in 2004 had an OPS of 1.422, and second-best is the 1.042 of Ted Williams in 1958.

Despite his age, Rodriguez is having something of a renaissance, given his struggles in the years leading to his 2014 suspension. His on-base percentage this season is his best since 2009, and his .539 slugging percentage is his best since 2008.

Rodriguez has hit three home runs of at least 450 feet this season, more than any other player in the American League. Giancarlo Stanton of the Miami Marlins leads the major leagues with seven homers of 450-plus feet in 2015.

Milestone watch

Rodriguez is 23 home runs shy of becoming the fourth player to hit 700. History tells us that he has a pretty good shot to pass Babe Ruth (714) for third on the all-time list and perhaps challenge Hank Aaron (755) and Barry Bonds (762).

The good news for Rodriguez is that several players have been able to hit that many home runs after they turned 40. Bonds leads the over-40 club, and Aaron ranks ninth on the all-time list (42). Ruth, on the other hand, hit six home runs in 28 games after he turned 40.

Lately, however, hitting that many home runs has been rare. Two players in the wild-card era (since 1994) have hit at least 38 home runs after turning 40: Bonds and Raul Ibanez, Rodriguez’s former teammate in New York.

This season, Rodriguez became the second player in major league history to record 2,000 RBIs. He has 2,027 and needs 271 more to take over from Aaron (2,297) for first place.

Only one player in baseball history has driven in that many runs after turning 40: Hall-of-Famer Carlton Fisk (282).

Rodriguez this season became the 29th player to reach 3,000 hits. How high on the all-time list can he expect to climb?

The three players next on the all-time home run list combined for 536 hits (Bonds: 261, Aaron: 262, Ruth: 13) after turning 40. The Elias Sports Bureau also notes that Pete Rose (691) had the most hits after turning 40 in the modern era (since 1900).

Including this season, Rodriguez has $61 million left on his current contract with the Yankees, more than three times more than any other player his age. Closest is Koji Uehara, who has $18 million left on his deal with the Boston Red Sox.

Other noteworthy careers after turning 40

MLB

Carlton Fisk: 282 RBIs (most in MLB history); played 465 games at catcher, 175 more than any other player who made his debut in the modern era.

Bonds: 79 home runs (most in MLB history), 2004 National League MVP (oldest player to win MVP)

NFL

Warren Moon: 37 passing touchdowns (most in NFL history)

Brett Favre: 5,874 passing yards (most in NFL history), reached 2009 NFC championship game with the Vikings

George Blanda: 802 points (all as kicker), most in NFL history; reached Super Bowl II with Oakland Raiders

NBA

Kareem Abdul-Jabbar: 1,941 points (most in NBA history), won 1987 and 1988 NBA Finals and reached 1989 NBA Finals

NHL

Gordie Howe: 113 goals, 154 assists and 267 points (most in NHL history); made two All-Star teams

Chris Chelios: Played 420 games played (most in NHL history); made 2002 All-Star team