its 100% guaranteed that this isnt going to happen for several reasons.
people are very protective of their props and armor. im about 99.999999999 % sure that there is no one that would actually lend out the armor.
if you did find someone that was actually willing to loan it out, then shipping is another problem. the chances that someone on this board is within driving distance from you is slim. and it would take at least 2 days to be shipped. and if you were to get one shipped, you would have to pay for the shipping.
another thing is everyones armor is scaled to fit their height, weight and dimensions. i know there are a few people your age on the board, but not too many at all. and on top of that, they are going to be shaped differently than you.
so yeah. best suggestion is to not worry about finding someone to lend you armor. they have the mass produced costumes floating around everywhere now. and if you dont like those, you can throw a set of armor together yourself with cardboard, ducktape, and green spraypaint. i know it sounds like it would be real low quality looking, but ive seen several people that have made it look really good.