[Fester Chugabrew]

Hiking the Grand Canyon is proof enough for any sentient being that the Earth is millions of years old.

Not without making assumptions about unobserved, and unobservable phenomena. You may see it as it is, but you cannot see beyond your own experience, let alone millions of years ago. Any sentient being can be a storyteller.

[RadioAstronomer]

Not without making assumptions about unobserved, and unobservable phenomena. You may see it as it is, but you cannot see beyond your own experience, let alone millions of years ago. Any sentient being can be a storyteller.

SN1987a shows the universe is at a minimum older than 170,000 years. The CMB of course shows it is far older. :-)