Oldest referee at the football (soccer) FIFA World Cup finals

According to Official Guinness Records,

The oldest referee to officiate a FIFA World Cup finals match is George Reader (UK) who was 53 years 236 days old when he refereed the final game of the 1950 World Cup at the Maracana stadium, Rio de Janeiro, Brazil, on 16 July 1950.
The match was won by Uruguay who beat the hosts Brazil 2-­1 in front of crowd estimated at 200,000 (although officially recognized by Fifa as 174,000) to go top of the final group and win the World Cup for the 2nd time.

For a complete list of 1950 records, please visit 1950 Guinness Records in Brazil.

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