"THE WHO Hits 50!" could be the legendary band's final tour — the chance to commemorate one milestone with another.

Singer Roger Daltrey and guitarist Pete Townshend will spend the bulk of their golden-anniversary year on the road, with an extensive tour that hits the Wells Fargo Center on Sunday and Atlantic City's Boardwalk Hall on May 22. (Can't make it? They'll be back at the Wells Fargo Center on Nov. 4.)

In some ways, it would be the perfect way to close this chapter of the Who's career. However, Daltrey and Townshend don't seem to be on the same page concerning what may happen after this tour ends in November.

"This time it really is our last," Daltrey recently told the Daily Express, in England. "This is a circus. We're 70 years old. We don't know how long it will go on for; it could be another 18 months, but that will be it. I've got to the point where I'm having physical problems with my body now, joints going and all that. … Everything from the past catches up."

The Who had to cancel three shows earlier this month after doctors ordered Daltrey to rest his voice, though the rest of the tour isn't expected to be affected.

Townshend isn't sure that the band is ready to stop just yet. In addition to the current tour, the Who recently signed on to headline the final night of the Glastonbury Festival next month.

"We've been in this place before," he recently told Rolling Stone, noting that the band has already played three "farewell" tours. "I don't know what's going to happen next."

Daltrey and Townshend are sure, though, that they want the shows on the current tour to be as strong as they can be.

The Who is bigger than it has been in years, with Daltrey and Townshend backed by a six-piece band that includes Zak Starkey on drums, Townshend's brother Simon on guitar and bassist Pino Palladino.

"This is the 50th anniversary of the band and for me as a songwriter," Townshend told Rolling Stone. "It feels to me like something that I couldn't just let go by. Also, this isn't just about me, and it's not just about Roger. It was important to give some sense of the measure of the commitment, and I suppose the gratitude, that we feel to the fans. We're still here, and so many people aren't."

After the death of bassist John Entwistle in 2002, Daltrey and Townshend considered breaking up but decided to continue.

"What Roger and I have realized is that there was a gift in it, which was that it made us look again at we two, at me as a songwriter and Roger as a singer, without any of this sense of glorifying the group, glorifying the gang," Townshend told Rolling Stone. "We found a way to work together, which turned out to be fairly simple. It was Roger telling me what songs he wanted to sing and me trying to find some way of providing the music that sustained him in doing that."