Sir Mick Jagger, who is still prancing and dancing a half-century after he first took to the stage in 1962, is about to become a great-grandfather at the age of 70.

Various media outlets reported Saturday that the 21-year-old granddaughter of the Rolling Stones frontman, Assisi Jackson, is expecting a baby in 2014. Assisi has been dating her boyfriend, a chef named Alex, for more than a year.

Jagger has seven children aged between 14 and 42 by four different women, as well as two other grandchildren. Assisi's mother is Jade, the daughter of Mick and his first wife Bianca.

Obviously Jagger shows no sign of slowing down. In a ranking of concert tours in 2013, the Rolling Stones came out on top.

Just this summer, Jagger and the Rolling Stones were performing in Washington D.C. when the singer threw some shade in the direction of President Barack Obama, who was not in attendance. "I don't think President Obama is here, but I'm sure he's listening in," the rocker told the crowd, according to tweets from the show. The reference to the NSA's domestic surveillance program apparently resulted in some booing, though it's unclear if they were voicing discontent at Jagger's quip or the president himself.

Besides Jagger, other rockers also have seen their families expand in recent years. Rod Stewart, for example, welcomed his first grandchild in 2011.

Earlier on HuffPost50:

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  • 1965

    The Rolling Stones performing in 1965.

  • 1967

    Mick Jagger and Keith Richards in the recording studio in 1967.

  • 1971

    The Stones farewell performance at Marquee in 1971.

  • 1966

    Brian Jones in 1966.

  • 1964

    Mick Jagger under a hair dryer in 1964.

  • 1964

    Brian Jones, Keith Richards and Paul McCartney.

  • 1968

    At Rock and Roll Circus in 1968. Keith Richards (on bass) joins John Lennon, Eric Clapton, and Mitch Mitchell from the Jimi Hendrix Experience on drums.

  • 1969

    Hyde Park Memorial concert, which was free, in 1969.

  • 2007

    Mick Jagger, Ronnie Wood, Keith Richards and Charlie Watts in 2007.

  • LIFE

    The new Rolling Stones book in honor of the band's 50th anniversary, published by LIFE.