Exodus 7:6-8

Young's Literal Translation

⁶ And Moses doth -- Aaron also -- as Jehovah commanded them; so have they done;

⁷ and Moses [is] a son of eighty years, and Aaron [is] a son of eighty and three years, in their speaking unto Pharaoh.

⁸ And Jehovah speaketh unto Moses and unto Aaron, saying,