[cfruapxv] Guess your age

I can guess your age from your answers to only a few simple questions.

• What year were you born?
• What calendar system do you use to count years?
• How much time have you spent traveling close to the speed of light?
• How much time have you spent near strong gravitational fields, e.g., in the vicinity of a neutron star or black hole?

(Inspired by a silly online quiz asking different questions that guesses very wrong.)