If you're talking about mt st Helens then it last erupted on 1st October 2004, but it is most notorious for its catastrophic eruption on 18th May 1980 at 8:32 am.
So about 7 years. =)
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Eyjafjallajökull, a volcano in Iceland, had been dormant for about 190 years before it erupted in 2010.
Last erupted somewhere between 150,000 and 200,000 years ago
A volcano that has erupted within historic time is an Active Volcano.
No. It last erupted a few hundred years ago and has been showing signs of renewed activity since 1980.
A dormant volcano.