Expanding on this. Number of starting players from each Central team going into their age 24-30 season (not bothering to look at relievers):
Cards (4) - Gorman, Nootbar, Edman, Donovan
Brewers (7) - Contreras, Turang, Ortiz, Adames, Frelick, Peralta, Hall (?)
Pirates (8) - Davis, Tellez, Cruz, Hayes, Reynolds, Suwinski, Keller, Ortiz
Reds (10) - Stephenson, Candelario, McLain, Steer, Friedl, Benson, CES, Greene, Ashcraft, Abbott
Cubs (10) - Busch, Hoerner, Swanson, Madrigal, Happ, Suzuki, Morel, Steele, Imanaga, Wicks (Bellinger would add another; Amaya overtaking Gomes would add another)
Honestly looking at depth charts to compile this reinforces how cooked the Cards are. At least one of the Cubs/Reds/Brewers will get strong collective development from their kids and blow past them.