The "Vierdaagse" (Dutch for "four days event") is an annual walk that has taken place since 1909. Based at Nijmegen since 1924, it now takes place in the third week of July. In 2016 it celebrated the 100th edition (reflecting that the marches were curtailed during the two world wars). Depending on age group and gender, walkers have to walk 30, 40 or 50 kilometres each day for four days. Originally a military event with a few civilians, it now is a mainly civilian event. Numbers have risen in recent years, with over 40,000 taking part, including about 5,000 military, and is now the world's largest walking event. Due to possible congestion on the route, since 2004 the organisers have limited the number of participants. Many take part every year, including several who have taken part in over 60 annual marches. The current record is held by Bert van der Lans, who completed his seventy-first march in 2018, at the age of 86.