>1
ちょうど今このスレ見つけて、今日見合ったので調べたよ。
この人じゃないかな。
Youngest coach for a World Cup team was Juan Jose Tramutola
of Argentina, 27 years and 267 days old when his country opened
their campaign against France in 1930.
http://www.planetworldcup.com/STATS/stat_apps.html