Iron Maiden are among the pioneers of heavy metal, but despite the fact that they are still going strong, bassist Steve Harris sees an expiration date approaching for the band.

He tells The Quietus, "I don't know about [us playing for another] ten years. I think we've certainly got another five years in us, but it's hard to say." The bassist says that health definitely factors into their future equation, adding, "As you get older, it gets doubly hard to keep yourself fit and in shape. We do work really hard on doing that. We'd be selling ourselves and everyone else short if we didn't, so we look after ourselves."

Harris, an avid soccer fan, says he's given up playing the sport for the most part. He adds, "I've had so many problems with my back that I can only play the odd match here or there. Unfortunately it's five years since I've played a full season of football and that's something that I miss a lot. But I had to make a decision. I play a lot of tennis."

With Harris seeing the end in sight, he's taking advantage of his time remaining in rock to do what he wants. Earlier this fall, he released his solo disc, 'British Lion,' which has been in the works for over a decade. Harris has gone in a more hard rock direction for the disc, and recently stated that the material was not "throwaway Iron Maiden stuff." He's currently gauging the response before deciding whether to tour in support of the effort.