This is well worth a read. It's by the excellent Sean Ingle, one of the few Guardian writers not in thrall to the gender woo-wah:
www.theguardian.com/football/2021/apr/27/teenage-girls-face-almost-double-the-concussion-risk-of-boys-playing-football
"Teenage girls face almost double the risk of concussion playing football compared with teenage boys – and typically take two days longer to recover from these injuries, a landmark study has found."
But yeah, let's let them play against teenage boys.