Nate Clements, LF
Nate Clements retires as the most valuable position player in MLB history. He was 28 when the league began but still managed to play 15 full seasons and retired at the age of 43. He won 8 Gold Gloves and 1 Silver Slugger and was invited to 6 All-Star games. He was also named the 1900 NL Division Series MVP, though he never won a World Series. He has the most career home runs at 95 and led the league in round trippers for 3 straight years in 1901-1903.
Career Stats: 9356 PA, 95 HR, .336 wOBA, 117 wRC+, 260 ZR, 67.2 WAR
Oliver Finnie, SS
Finnie had a very good MLB career and is the first Hall of Fame player to be created after the league began - he joined the Indiana Hoosiers after the 1900 draft. He inexplicably played in the Independent Leagues in 1915 after a very good year with Pirates in 1914 and then even more unexplained retired after putting up 3.9 WAR with the Long Island Ducks. He definitely had injury issues throughout his career but was still providing very good value.
He was drafted by the Cubs in the 4th Round of the 1903 draft and the very next year began putting up big numbers in the Major Leagues. He was voted into 4 All-Star games, won two Gold Gloves, one Silver Slugger, and one World Series. He also finished 2nd and 3rd in the MVP voting in 1905 and 1907, respectively. He surpassed Kevin Kramer's mark as the most valuable short stop, but both of them have already been beaten by 29-year old Tomas Reed.
Career Stats: 4550 PA, .313 wOBA, 106 wRC+, 175.1 ZR, 49.5 WAR
Ron Griffin, RHP
Griffin won the Rookie of the Year award in 1902 having never even been named to a prospect list. He then had a very steady 12 year career providing solid middle of the rotation value, mostly to the Colorado Rockies. In that time he only had one serious injury, losing 4 months with a torn triceps.
Career Stats: 3137.3 IP, 730 BB, 1149 K, 2.75 FIP, 96 FIP-, 46.7 WAR
Danny Kane, LHP
Kane was a very steady middle of the rotation starter for the Red Sox, with one all-star team on his resume and one World Series championship. He was the #82 prospect in 1900 and pitched until he turned 40.
Career Stats: 3271.3 IP, 897 BB, 1128 K, 2.83 FIP, 99 FIP-, 44.4 WAR
Lochlan Collyer, RF
Collyer was an up and comer, providing 12.3 WAR of value in his age 25 and 26 seasons, but his value dropped sharply once he turned 30. He went to three All-Star games and won a Gold Glove but was quickly relegated to the Indy League. He did play well there in 1915 but must have decided to retire instead of continue in that league.
Career Stats: 5821 PA, 557 SB, .319 wOBA, 109 wRC+, 79.9 ZR, 31.1 WAR
Ahmad Torres, RHP
Torres was a good closer for nearly a decade, primarily for the Texas Rangers. He made one All-Star team and a World Championship. He was drafted 22nd overall in the 1903 draft out of Alabama and debuted in 1904 at the age of 22.
Career Stats: 644.3 IP, 294 BB, 420 K, 245 SV, 2.43 FIP, 90 FIP-, 11.1 WPA, 8.1 WAR