Yea that's the point, how do you know which ones are fully developed by 25 and which ones aren't? And how do you know the extent of brain development without some kind of weird brain test? Some 30 year olds are gonna have more developed brains than other 30 year olds. Some 23 year olds are gonna have more developed brains than some 38 year olds.

Also keep in mind that the racial thing isn't a spectrum, while the age thing is: ALL whites have more power than ALL blacks in the US ceterus paribus, but this is not even close to true for all 32 year-olds versus all 22 year olds. American judges, juries, and cops display INSANE favoritism for whites that allows them to do almost whatever they want to POC, but they DO NOT display anywhere near this same favoritism to older men. By your logic one should be EXPONENTIALLY MORE critical of an interracial couple than an age gap one, especially if the male is white.