YOU SAID:

when you realize ice age is now older than dirt

INTO JAPANESE

氷河期が土よりも古いことに気付いたとき

BACK INTO ENGLISH

When we realized that the Ice Age was older than the soil

INTO JAPANESE

氷河期が土よりも古いことに気づいたとき

BACK INTO ENGLISH

When we realized that the Ice Age was older than the soil