Repeating a Year at Prestigious Boarding Schools

Can anyone explain if there is an impact from reclassing, other than the obvious advantage of being more mature socially, academically and theoretically. The developmental advantage is obvious.

What I am asking is if a student gets a penalty at any point? Or is there only advantage? Do they age out of sports? It doesn’t seem fair to have 19 year olds on a high school soccer team?

If a student is from the southern hemisphere, they will have to do a “half-year reclass” because the seasons do not align. Is this bad? Good? Doesn’t matter?

I hadn’t thought too much about this, but this thread now has me thinking. Thanks.