The earths age is incalculable unless you were to somehow be able to count it's rings of cataclysmic events 😏 everything on the surface of the planet today will be recycled through the mantle at some point. Even the ancient stuff archeologists have dug up. It's probably something like every hundred thousand years the earth does a pole shift and recycles everything and starts over again from caveman to advanced civilization over and over. Why I don't believe in heaven/hell and snowflake souls(egos) you don't get to take anything with you when you die, not even your memories. Dementia patients lose their "souls" before they even die. Life is eternal, your energy is eternal. Just not your current character you're playing