They say that “Time is life and life is experience”
To have a life one needs to spend active time in It, and for to say they have lived, they would have collected numerous experiences in an active life.
Experiences over time builds up what others call gut feeling… a responsive / reactive / proactive bank of auto-applicable, randomly accessible knowledge.
A life lived in full provides experiences, perhaps proof of an existence is a living world.
For darkness to exists the absence of light must prevail as much as light is the absence of darkness.