Funny thread, thought it was just me. I am 6’3”, 200 lbs and 66 years old. My shoes and boot sizes vary a lot, but have gotten bigger. Measure to an 11.5 on a shoe size scale, but wear everything from a 10 (Lacrosse Aerohead Sport 3.5mm) to a 14 in an insulated Lowa Renegade hiker. Generally try on a 12 and adjust accordingly. Moral of the story: Try on before buying.