Measurements from NASA's COBE (Cosmic Background Explorer) "pegs the age of the Universe at 13.7 billion years old, with a remarkably small one percent margin of error" [1]. So, pretty much the same thing that dvvel said.

Even more exciting is the discovery of anisotropy in the microwave background (Nobel prize for physics in 2006) - the irregularities that are indicative of the beginnings of galaxies. One of the criticisms of the big bang theory was that the microwave background was so constant, so how could various clumpy shapes be born of an isotropic explosion? But now, with more accurate and precise instrumentation, we've been able to measure the minor fluctuations that allowed galaxies to form. Very cool.