We are supposed to treat people as individuals, not discriminate based on characteristics such as sex or race. My eldest son is gifted and started kindergarten

We are supposed to treat people as individuals, not discriminate based on characteristics such as sex or race. My eldest son is gifted and started kindergarten at 4y1mo. Now he is graduating with a 4.0 GPA in computer engineering. One data point does not prove what the ideal age to start kindergarten is, but there should be measures of readiness that are not based strictly on age.