Awesome move by the Redskins ... they found out a big fan was about to celebrate her 107th birthday -- so they showed up and threw her a b-day bash!!!
It all went down at Brandywine Living in Alexandria, Virginia on Thursday, when Redskins prez Bruce Allen and team play-by-play man Larry Michael popped in to celebrate with Carletha "Nana" West.
West -- who was born on July 18, 1912 (!!!!) -- says she became a 'Skins fan way back in the 1930s ... so the Redskins reps just had to swing by with gifts.