Time passes measurably faster at the top of a mountain than at sea level
Einstein's general relativity predicts that time runs slower in stronger gravitational fields. This means clocks at sea level run slightly slower than clocks at higher altitude (where gravity is weaker). This effect is not theoretical — GPS satellites must account for it. A clock on Everest gains about 39 microseconds per year relative to sea level. Atomic clocks have measured this effect at height differences of just 33cm. You literally age faster on a mountain than in a valley.
The time difference is tiny in everyday terms but it is real, measurable, and has to be corrected for in every GPS system you use — your navigation app runs because someone understood Einstein's equations.
“Time passes faster at the top of a mountain than at sea level. You age very slightly faster the higher you live.”