Turned eighteen a week after graduation. Daughter was 17y-10m. I was 18y-5m. I never gave this much thought. I never gave thought to one of my high schools was one of the largest in the country with a lot of competition. I never gave thought to my kids were in a large classification high school. It’s just what it was. Take the field, court, etc. and complete.
My kids played with their friends in their age group until middle school. Then they played up to their ability. There wasn’t a grand plan. It’s just the way we did it.