Pyramids are very old buildings

(1)I’m amazed that modern people and old people made it!
(2)I’m amazed that a man and an old man made it 1000 years ago!
(3)I’m amazed that a man and an old man made it 2000 years ago!
(4)I’m amazed that a man and an old man made it 3000 years ago!
(5)4000 years old. Yeah, make something