Would these be too tight for an 80lb 12 year old?

A bit hard to say. They fit a 91 lb 11-year old fine.

what size/age/weight do these fit?

Age and weight are a little less helpful than circumference. "Product Dimensions: 9 x 6 x 1 inches", presuming the length is 9 inches, then the information that's needed here is the circumference of the leg roughly 4.5 inches above the center of the knee. Again presuming the width is 6" (folded and at the top), roughly a 12" circumference (not stretched). It also depends on how elastic these are too. I'm looking at these for my daughter who's circumference is 12" at that point. This might mean it will just fit but could slip down if she has too much forward momentum when landing on her knees. I'll probably look for ones that are a little tighter.

Brand	MIKASA
Age Range (Description)	Adult
Colour	White
Material	Cotton
Closure Type	Pull On
Special Feature	Eliminates Odor
Form Factor	Shell
Sport	Volleyball
Item dimensions L x W x H	30.5 x 25.4 x 10.2 Centimeters
Number of Items	1
Size	830JR - Junior
Item Package Quantity	1
Water Resistance Level	Not Water Resistant
Is Waterproof	False
Model Name	Mikasa 830JR Competition Antimicrobial Kneepad, White
Item Weight	0.13 Kilograms
Global Trade Identification Number	00080409014594
Manufacturer	Mikasa Sports USA
UPC	080409014594
Batteries Included	No
Included Components	Mikasa 830JR Competition Antimicrobial Kneepad, White
Length	12 Inches
Width	10 Inches
Height	4 Inches
Weight	1 Pounds
Material Type	Cotton
Number of Pieces	1
Features	Eliminates Odor
Country of Origin	USA

Youth Volleyball Knee Pad

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