Question: how many years has wrestling been observed on cave drawings in France?
About the article "Wrestling", section "History".

Candidate passages:
Wrestling represents one of the oldest forms of combat.
Literary references to it occur as early as in the Iliad, in which Homer recounts the Trojan War of the 13th or 12th century BC.
The origins of wrestling go back 15,000 years through cave drawings in France.
Babylonian and Egyptian reliefs show wrestlers using most of the holds known in the present-day sport.
In ancient Greece wrestling occupied a prominent place in legend and literature; wrestling competition, brutal in many aspects, served as the focal sport of the ancient Olympic Games.
The ancient Romans borrowed heavily from Greek wrestling, but eliminated much of its brutality.
During the Middle Ages (fifth century to fifteenth century) wrestling remained popular and enjoyed the patronage of many royal families, including those of France, Japan and England.
Early European settlers in America brought a strong wrestling tradition with them if they came from England.
The settlers also found wrestling to be popular among Native Americans.
Amateur wrestling flourished throughout the early years of the North American colonies and served as a popular activity at country fairs, holiday celebrations, and in military exercises.
The first organized national wrestling tournament took place in New York City in 1888, and wrestling has been an event at every modern Olympic Games since the 1904 games in Saint Louis, Missouri (a demonstration had been performed at the first modern Olympics).
The International Federation of Associated Wrestling Styles (FILA) originated in 1912 in Antwerp, Belgium.
The 1st NCAA Wrestling Championships were also held in 1912, in Ames, Iowa.
USA Wrestling, located in Colorado Springs, Colorado, became the national governing body of amateur wrestling in 1983.
It conducts competitions for all age-levels.
In most recent years, there have been explicit drawings and graffiti on, around, and in the ice cave. 
History of discovery.
Nearly 340 caves have now been discovered in France and Spain that contain art from prehistoric times.
Initially, the age of the paintings had been a contentious issue, since methods like radiocarbon dating can produce misleading results if contaminated by samples of older or newer material, and caves and rocky overhangs (where parietal art is found) are typically littered with debris from many time periods.
But subsequent technology has made it possible to date the paintings by sampling the pigment itself and the torch marks on the walls.
The choice of subject matter can also indicate chronology.
For instance, the reindeer depicted in the Spanish cave of Cueva de las Monedas places the drawings in the last Ice Age.
The oldest known cave art comes from the Cave of El Castillo in northern Spain.
Hand stencils and disks made by blowing paint onto the wall in El Castillo cave were found to date back to at least 40,800 years, making them the oldest known cave art in Europe, 5–10,000 years older than previous examples from France.
This date coincides with the earliest known evidence for "Homo sapiens" in Europe.
Because of the cave art's age, some scientists have conjectured that the paintings may have been made by Neanderthals.
The second-oldest known cave art is that of Chauvet Cave in France, the paintings of which date to earlier than 30,000 BCE (Upper Paleolithic) according to radiocarbon dating.
Some researchers believe the drawings are too advanced for this era and question this age.
However, more than 80 radiocarbon dates had been obtained by 2011, with samples taken from torch marks and from the paintings themselves, as well as from animal bones and charcoal found on the cave floor.
The radiocarbon dates from these samples show that there were two periods of creation in Chauvet: 35,000 years ago and 30,000 years ago.
One of the surprises was that many of the paintings were modified repeatedly over thousands of years, possibly explaining the confusion about finer paintings that seemed to date earlier than cruder ones.
In 2009, spelunkers discovered drawings in Coliboaia Cave in Romania, stylistically comparable to those at Chauvet.
An initial dating puts the age of an image in the same range as Chauvet: about 32,000 years old.
In Australia, cave paintings have been found on the Arnhem Land plateau showing megafauna which are thought to have been extinct for over 40,000 years, making this site another candidate for oldest known painting; however, the proposed age is dependent on the estimate of the extinction of the species seemingly depicted.
Another Australian site, Nawarla Gabarnmang, has charcoal drawings that have been radiocarbon-dated to 28,000 years, making it the oldest site in Australia and among the oldest in the world for which reliable date evidence has been obtained.
Other examples may date as late as the Early Bronze Age, but the well-known Magdalenian style seen at Lascaux in France (c.15,000 BCE) and Altamira in Spain died out about 10,000BCE, coinciding with the advent of the Neolithic period.
Some caves probably continued to be painted over a period of several thousands of years. 
Cave paintings have been found in the Lascaux caves in France that have been suggested to depict sprinting and wrestling in the Upper Paleolithic around 17,300 years ago.
Cave paintings in the Bayankhongor Province of Mongolia dating back to Neolithic age of 7000 BC show a wrestling match surrounded by crowds.
Neolithic Rock art found at the Cave of swimmers in Wadi Sura, near Gilf Kebir in Libya has shown evidence of swimming and archery being practiced around 6000 BC.
Prehistoric cave paintings have also been found in Japan depicting a sport similar to sumo wrestling. 
The Cave of Niaux is located in Niaux in the Ariège "département" of south-western France.
Like Lascaux it contains many prehistoric paintings of superior quality, in the case of Niaux from the Magdalenian period.
From the very beginning of the seventeenth century the cave was of great interest for tourists, who left numerous traces on its walls.
People visiting the cave did not imagine that the paintings of the "Salon Noir" were so old - only in 1906, thanks to captain Molar and his sons who made a plan of the cave and discovered the paintings of the "Salon Noir", did Niaux attract specialists' attention.
In 1907 it was investigated by H. Breuill and E. Cartailhac, but the discovery of the "Salon Noir" paintings was only the beginning.
In 1925 J. Mandeman found a gallery with some black paintings and called it Cartailhac Gallery.
Later it was established that the paintings had been emerging on the cave walls during a long period between 11500 and 10500 years BC.
The main entrance to the Niaux cave used for visitors is now further up the hillside than it once was.
In ancient times, there would have been several lower, smaller entrances.
The visits to the cave are strictly regulated in order to maintain an even temperature of 12 degrees C and thus preserve the wall drawings of bison, horses and ibex.
July through September there are 11 visits per day of up to 20 people with 45 minutes between each group, including a tour in English at 1:30pm.
Three visits per day the rest of the year (some English tours).
The caves are not lit up, visitors are handed torches, another measure to protect the paintings.
Furthermore there is always the risk for one or two of the torches running out of battery during the visit, small children and anyone afraid of darkness should not go on this tour, once the tour has started there is no turning back.
The walk to the paintings lead through both big caves and narrow passages.
The cave floor has been left in its natural state: wet, very uneven and slippery in places so sturdy walking shoes are essential.
It is recommended to book ahead.
However, outside the ticket office a sign indicates how many spaces are left (if any) in the day's scheduled tours.
If you arrive in the morning you might be able to reserve a spot in a tour in the afternoon.
But don't count on this in July and August.