no
No They wouldn't have.
The word was coined towards the end of the 19th century, so no.
no
You would have to live three Earth-years to be three years old.
Brian Helicopter is 53 years old (birthdate: June 27, 1958).
Leonardo da Vinci drew a helicopter about 500 years ago
Three years older than I am today.
If you were three score years and ten, you would be 70 years old. A "score" is 20 years, so three score would be 60 years, plus an additional 10 years gives you a total of 70.
It was 36 years between the first airplane flight and the first helicopter flight. The Wrights flew in 1903, Sikorsky flew his first helicopter in 1939.
A score is defined as 20 years. So it would be 60 years.
They have been around for 70 years
Three centuries is 300 years, so 300 + 79 would be 379 years.