Hai cercato la traduzione di seventies da Inglese a Giapponese

was it the seventies?
70年代？

ahh. you're a seventies freak.
ああ 君は70年代ファンか

well, that puts him in his... seventies now?
それじゃ 今は70代か？

then fasten him with a chain seventy cubits long:
更に70腕尺の長さの鎖で，かれを巻け。