Let’s put aside the year of the PBP inception, when only the youth was tempted by the novelty of the challenge. Of course, there were no repeat offenders, and PBP will never again find such youth. Then it is probable that those of 1948, who would have left in 1941 if PBP had taken place, would have been around thirty years old rather than 37.
The rest is surprisingly stable until 1979 with an average age of 37. The slight ageing trend of + 2 years, in 1983 and above, has a simple explanation: the FFC/FFCT convention agreement forbidding the organization of races under the aegis of the FFCT, thus closing the door to young people, or at least pushing them to open the door to recently created cyclosportives (cyclo-sporting event).
Officially, PBP was not a race, but those who knew it well will admitt that it looked like one.
Then the participants got older with a depleting pool of new blood. The average age increased almost linearly from one edition to the next, reaching 50 in 2011. Later on, the arrival of new participants, most often foreigners, stopped this slow degradation and stabilized the average age at 50 for the last three editions.
Unfortunately 2023 has not confirmed a reversal of the trend and on the contrary the average age has taken another year longer.
The fact remains that the overall average age of 47 years is abnormally high for a sporting event of the difficulty of Paris-Brest-Paris. Between now and 2031, which will be the year of the centenary of Paris-Brest-Paris Randonneur, there will be two editions to bring this age down to a value that is no longer that of a veteran.