A randonneur is a long-distance cyclist, especially one who participates in randonneuring events. A randonneur enters a randonneuring event known as a randonnée or brevet – an organised long-distance, non-competitive bicycle ride. The distance is 200 km, 300km, 400 km and 600 km.

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LeRoy Varga is the oldest man to complete the Paris-Brest-Paris Randonneur.
He, in fact, completed the event, held every four years, in 1987, 1991 and 1995.

Riders are expected to carry clothing for inclement weather, spare parts and tools. Rides in excess of 300 kilometers frequently involve night riding and require lights, spare bulbs and reflective gear.

The Origins of Randonneur Cycling: Maurice Martin 1861 – 1941
by Ken Dobb, For an Old Hand at Cycling, Just Another 750-Mile Ride – New York Times