spatially flat, expands to infinity
Below is a plot of the time evolution of the cosmic scale factor. The filled dot represents where we are on this plot at the present time.
The age of the universe for a given value of 
and 
depends on the value of 
that we measure observationally. Below is a plot of the age of the universe vs. . ( is believed to be 70
10 km/s/Mpc, but its value is widely debated.)
These values of and lead to a moderately aged universe.