LMFAO aren't the only who know how to party rock! Someone recently posted this video of their 90-year-old grandmother in a stylish red, velour sweat suit getting down and funky to "Party Rock Anthem" by LMFAO. Okay, she pretty much just goes around in a circle and occasionally throws her hands up in the air, but come on, she’s 90 years-old for God’s sakes!  ♫ Go granny, go granny, it’s your birthday ♫