Say the Universe is 13.8 Billion Years old.

You go on a trip. It's your 30th birthday.You depart from Earth. A Supermassive black hole courteously holds you in orbit for an indiscriminate period of time.

You return safely to Earth, 25 years after leaving.

How old are you? How old is the universe?

Light is a constant. But light doesn't experience time.

That's why light is a constant.

Try again.

4 minutes ago, coepernicium277 said:

25 years after leaving

As measured by which clock?

Respond to the poll. Maybe your opinion will contribute to an answer.

8 minutes ago, Markus Hanke said:

As measured by which clock?

"I grew up on the moon, next to a neutron star in a stable orbit of 101 dalmatians.

My planet is 1/8 the age of the universe, and I am 1/97th the age of my planet.

By what clock am I 37 years old?"