Thinking about age is a waste of time. It can only become an excuse. My son has a May birthday. He was also a physical late bloomer. Through high school he competed against some athletes in his class who were more than a year older.
The summer after 7th grade he started playing travel ball grade appropriate rather than his age group. Starting with post freshman summer he played up another year.
If a kid is young and you want to change the situation 8th grade should be repeated before high school eligibility starts. Another option is a PG year after high school. But it’s a waste of time and money for an academically talented kid.