I've never given any thought to this until recently.
DS1 is a very able reader and a relative who's a retired teacher has asked, more than once, what his reading age is.
Then I was at a friend's for coffee and another mother said her (I think) 10 yo had a reading age of 16.
I've googled it but what I found only went up to 14 point something.
Just curious I suppose, does it mean anything? If it's still used where is the best place to find info please?