Question: The Austrian band that released War of Ages in 2013 was originally formed when?

Context paragraphs:
War of Ages (Serenity album): War of Ages is the fourth full-length studio album by Austrian symphonic metal band Serenity.  The album was released on March 22, 2013 in Europe and sometime in March or April in North America and Asia, via Napalm Records.

Spitalo Fatalo: Spitalo Fatalo was the third album to be released by Austrian band Erste Allgemeine Verunsicherung.  It was released in 1983 in Germany and reissued a few times for a few other countries and formats.

Look at These Eyes: Look at These Eyes is the first EP from Austrian melodic metalcore band Sympathy for Nothing.  It was released in 2008 and was sold at the semi-finals of Austrian Band Contest.  It consists of six tracks.

Serenity (band): Serenity is an Austrian symphonic power metal band, which was originally formed back in 2001.  However, it became a more stable group with a consistent line-up in 2004, when it also began using more progressive and power influences than earlier.  They have defined their genre with more melodic and symphonic metal elements.

Seiler und Speer: Seiler und Speer is an Austrian band from Bad Vöslau that formed in 2014.  The band is composed of comedian and actor Christopher Seiler and film producer Bernhard Speer.

Das was wir sind: "Das was wir sind" is the debut single from the album "Diese Stadt," by the Austrian band Mondscheiner.  It was released on 7 July 2006 and reached #10 on the Austrian charts.

Golden Dawn (band): Golden Dawn is an Austrian band formed by Stefan Traunmüller, originally as a one-man black metal project, in 1992.  It eventually attracted the attention of two influential Austrian metallists, Ray Wells of Pazuzu and Martin Schirenc of Pungent Stench and Hollenthon, which led to a compilation appearance and eventually a recording contract with Dark Matter Records.

Erste Allgemeine Verunsicherung: The "EAV" (Erste Allgemeine Verunsicherung, German for "First General Confusion/Uncertainty/'Uninsurance'") is an Austrian band that was formed in 1977.

I Am Yours (song): "I Am Yours" is a song performed by Austrian band The Makemakes.  The song represented Austria in the Eurovision Song Contest 2015 where it finished second to last place, scoring zero points.  It was released as a digital download in Austria on 6 March 2015 as the lead single from their debut studio album "The Makemakes (album)" (2015).  The song was written by Jimmy Harry, Dominic Muhrer, Paul Estrela, Florian Meindl and Markus Christ.  The song has peaked at number 2 on the Austrian Singles Chart.

I will leb'n: "I will leb'n" is a song originally recorded by Austrian band Steirerbluat, later notably covered by DJ Ötzi.

Supporting paragraphs: War of Ages (Serenity album) Serenity (band)
Answer: 2001