How long ago was the Meteor Crater in Arizona formed?

Meteor Crater in Arizona is the world’s best preserved meteorite impact site on Earth. It got the moniker “Meteor Crater” by the US Board on Geographic Names from the nearest post office named Meteor. It was formerly known as the Canyon Diablo Crater and fragments of the meteorite are officially called the Canyon Diablo Meteororite. It is nearly one mile across, 2.4 miles in circumference and more than 550 feet deep, and is surrounded by a rim that rises 148 ft above the surrounding plains. The center of the crater is filled with 690-790 ft of rubble lying above crater bedrock. The crater was formed about 50,000 years ago. Since its formation it is thought to have lost about 66 ft at the rim crest due to natural erosion. Daniel Barringer, was first to suggest that it was produced by meteorite impact. The object that excavated the crater was a nickel-iron meteorite about 50 meters (160 feet) across weighing about 10 megatons and was mostly vaporized upon impact.