Grade should not matter...i know much of the club lacrosse world still goes by it, but birthdate should... Because they are in 6th/7th grade does not solely qualify them for U-13, being born between the US Lacrosse guidelines does. So if we are talking U-13 leave it at that, and not what school grade they are - people unfortunatley can and will manipulate that. I understand this is a 2018 thread - but if US Lacrosse ever gets its act together and enforces the rules they have written...it will be easier for everyone to understand and follow.....