64 yrs years old Square Root of 4096 64th birthday T-Shirt-FL

Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 65% Cotton, 35% Polyester, Imported, Machine wash cold with like colors, dry low heat, Funny simple math age number problem, 64yrs 64 years old 64th b-day bday geek geeky nerd nerdy gift idea graphic b-day tee shirt. Looks good in more color choices plus range of sizes too for people you loved: her him mom dad, ladies girls boys teens, Awesome gift for yourself or for your friend”s b-day celebration vintage faded effect text statement t shirt. Lightweight, Classic fit, Double-needle sleeve and bottom hem