Originally posted by josephw
And what is time?
We can make some guesses at the age of the universe based on our current understandings - they mostly end up at around 12 or 13 billion years old, with a bit of variation in these figures.
Any age estimate is dependent on a number of things and so as our understanding of the universe changes over time, we might expect our estimate of its age to change too, although I suspect it's somewhere around this age.
What is time?
I'm not exactly sure what you're asking here. My view of time is that it is our sense of progression through our lives.
There are many scientific aspects to our understanding of time - thermodynamics and entropy, special relativity and the rejection of absolute time, general relativity and the notion of wormholes allowing a sort of bypassing of normal time, and so on.