Kodak has NEVER aged film to the optimal point. Urban legend, started by some nitwit at Popular Photography who totally mis-understood the explanation from someone at Kodak. Since then it has stuck, but it has always been a canard. Kodak can make any film at any color balance they desire, they don't "select" or "age" any color film. They even make films with subtly different color balances for different markets, particularly based on the local skin color.
Yes, Kodachrome used to shift in color balance due to oxidation of the sensitizing dye in the green-sensitive emulsion layer. So consumer Kodachrome was shipped with a green color balance, chosen to shift red-ward to a neutral color balance after passing through the distribution channel and waiting for the consumer to expose and process the roll. Kodakchrome Professional was manufactured and shipped with a neutral color balance, because it was going to shipped and stored cold until used. This red shift was especially problematic with Kodachrome 200, I never got a properly color-balanced roll of the consumer version, but the Kodachrome Professional 200 was always dead-on.
The modern Kodak professional films are not designed with the constraint of having to age well at room temperature. That's a major constraint on the "Gold" C-41 films, and imposes limits on what they can do in the design. The professional films are expected to be shipped and sold cold, exposed promptly, and processed promptly.