The rocker and bandmate Pete Townshend have 54 shows booked for 2015 as they embark on what will be their final world trek, but he reveals there's no end in sight right now.

He tells Rolling Stone magazine, "If people want to add shows and we still feel great, then it will go for a while longer, but not that much longer. It might last two years.

"The shows are the joy. We do the shows for free. We get paid for the travelling and the schlepping. That's the gruelling bit. After 50 years on the road, with hit records, that's the bit that becomes lonely at times. We're away from our families. We're in a different bed every night, or every other night."

He adds, "I also know that Pete wants to make another record. He's just talking about it. I've heard a couple of tracks, which are great.

"There are loads of things we can do in the future, but we can't keep doing this sort of tour. This bit of our career is closed, but maybe two more doors open up. Pete is an incredibly vibrant musician. I could see us playing acoustically in some ways... Then you don't have to tour; you just get down in New York for a couple of weeks. That's not touring. It's a piece of cake. You go home every night. It would be civilised."