It also makes more sense when one considers that It took 7 days according to Genesis, and on the 8th DAY GOD RESTED.
I do not remember ever reading about a 9th Day.
Ergo, we are living in the 8th Day.
How long is that 'day'?
It hasn't ended yet, so we can't tell. If the 8th day ever ends, then we will know exactly how long the 'heaven and Earth and the Universe' have existed.
WAIT A MINUTE.
Wrong planet. Earth was created 6 days ago and we are in the 7th day.
Sorry, I only recently moved to this planet and it takes some adjusting.