This is written in my CGP revision guide and my intuition is telling me otherwise.
Here is my reasoning:
Increased average density of the universe reduces the rate of expansion.
So if a larger density slows down the rate of expansion then it should take a longer time to expand to its current size with increased density.(This is all assuming the BB theory is correct, not steady-state, and ignoring new theories regarding rapid inflation.) Hence for a larger density, it must have taken a longer time to get ot current size, hence the universe is OLDER.
Also, there is a graph in my book of size against time for flat, open and closed universe and the one for open (with lowest density) reaches any given size in the shortest time, so surely it is 'the denser the universe is, the older it is'?
Or am I talking BS. Thanks