I think it is really unusual but accept my experience is limited to my own school experience and my DS who is 14 but still in 'mates/FIFA' mode as are all his friends.
Just curious as one of my friend's DS started a relationship when he was 13 (year 9) and his girlfriend would have been 12/13 (year 8) and they are still together 12 months on! Accepting that for a huge chunk of that time, they haven't actually been able to see each other due to lockdown/tier arrangements
.