#1 Salvador Reyes (71 years)
Salvador Reyes was a Mexican legend who played most notably for Chivas or CD Guadalajara in the 1950s and 60s. An international who played 59 times for his country, Reyes is still Chivas' top-scorer.
Reyes played in three World Cups for Mexico and was a part of the early years of the NASL in the USA where he played for the San Diego Toros. Reyes worked in management till the 1980s and also played the role of Sporting Director for Chivas USA in the MLS. In 2008 at the age of 71, Reyes was honoured by his club.
As a part of the occasion, he was named in the squad and started the game for them against Pumas (UNAM). He was substituted soon after and a resounding ovation followed. He might not have actually played for the side much, but it still counts as an official appearance.
That means the record for the oldest player worldwide to appear in a matchday squad will take some beating!