CREATE TABLE table_64439 ("Match" FLOAT, "Date" TEXT, "Competition or tour" TEXT, "Ground" TEXT, "Opponent" TEXT, "Score1" TEXT)

On what date is there a match lower than 14 with a ground of H and the opponent Aston Villa under 18s?
SELECT "Date" FROM table_64439 WHERE "Match" < '14' AND "Ground" = 'h' AND "Opponent" = 'aston villa under 18s'
SELECT "Date" FROM "table_64439" WHERE "Ground" = 'h' AND "Match" < '14' AND "Opponent" = 'aston villa under 18s'