By Kati Johnston
Special to MSN Entertainment

If folks in Hollywood are saying that "70 is the new 49," it's probably because this year an amazing number of pop culture's most influential actors and musicians turned that milestone age -- and they're still going strong. These birthday kids, once the Young Turks of Hollywood, helped shape the seismic culture of the '60s and '70s in innovative, creative ways. At 70, they continue to forge new trails and influence countless younger artists following in their footsteps. (Bjorn Larsson, Andrew Crowley, Richard Stonehouse/Retna Ltd.)