Andy Livingston has the most receptions by a 20-year-old player in a season, with 1 catch in his rookie season in 1964.

nfl most catches in a player's age 20 season
NAMESEASONTMGPRECAGETRGREC YDSREC AVGREC YDS/GREC TDRUSH YDSATTRUSH AVGRUSH YDS/GRUSH TD
Andy LivingstonAndy Livingston1964CHICHI212000.00.00-32-1.5-1.50
StatMuse has season-level data for receptions going back to the 1932 season.

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