XRobo just locked the other one when it was getting interesting again, so continue here.
Discussion about age of universe is go.
So, yeah, 13.73 billion years, to within 1% error (that is 0.12 billion years) according to heat readings. Fancy stuff.
The Lambda-CDM concordance model describes the evolution of the universe from a very uniform, hot, dense primordial state to its present state over a span of about 13.73 billion years of cosmological time. This model is well understood theoretically and strongly supported by recent high-precision astronomical observations such as WMAP.