Ebenezer: In Japan there are possible ruins claimed by some to go back to 8000 BCE. The Stonehenge and Pyramid. Apparently, the oldest stone tools like handaxes go right back to the Lower Palaeolithic age, about 2 million years ago. It all depends on what you call a man made object.
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The largest of the seven wonders of the ancient world is believed to be the Great Pyramid of Giza. It is the oldest and only structure still intact today.
Jacksonville University's mascot Nellie the dolphin is the oldest living mascot as well as the oldest dolphin in human care. She is 57 years old. She's also received her master's degree from JU and starred in a Timex watch commercial.
The oldest man in prison is Masazo Nonaka, a Japanese man who was born in 1905. He was convicted of murder in 1971 and is currently serving a life sentence in a Japanese prison.
The Viking 1 lander is generally regarded as the first major probe that has landed on Mars. It landed in 1976. It was the first man made object to land on the surface of Mars.
The farthest man-made object from Earth is Voyager 1 spacecraft, which was launched by NASA in 1977. It has since traveled beyond our solar system and continues to transmit data back to Earth. Hubble Space Telescope is in low Earth orbit and not as far from Earth as Voyager 1.