There are 3 known bands who use the name Ice Age:

1) Ice Age is a progressive rock / metal band, founded in the early 90s. Their debut album "The Great Divide" (1999) was a great prog album in the vein of bands like Dream Theater and Vanden Plas. In 2001 the band released "Liberation" which was followed by a self-financed EP in 2003 due to the end of the band's contract with Magna Carta.
Though hailed by many prog fans as an awesome (yet underrated) band, Ice Age never sold many albums and disbanded in 2005 to continue on with a totally different (non-prog) approach under the name "Soulfractured".

2) Another band called Ice Age was active in the mid- to late 80s. It consisted of 4 Swedish girls who played heavy/thrash metal rather influenced by Megadeth. They disbanded after releasing 3 demos and recording a video that got some airplay in the U.K. For a good information page, see Metal Maidens.

3) ICE AGE is also the name of a hardcore band formed in Smithtown, NY. This band consists of former and current members of This Is Hell, Up The Fury, Soldiers, etc. They released an untitled 4 song demo in 2007. Visit their MySpace page here: http://www.myspace.com/motherfuckingiceage