Opening Day 2026 Rosters Reveal Youth Surge Amid League-Wide Aging Trends

Baseball America catalogs the 20 youngest and 20 oldest players on 2026 MLB Opening Day rosters in both leagues, highlighting rookies like Kevin McGonigle and Samuel Basallo for the AL and Junior Caminero among the NL’s young standouts; the St. Louis Cardinals have the youngest Opening Day roster, while the Atlanta Braves are the oldest, with the Red Sox representing the most average age, and pitchers generally aging slower than hitters across MLB.