Many are in their 50's. They are no longer the young stars of yesteryear, even if they think they are or still wish to be. Everyone gets older (if they're lucky) and now we are seeing how they really look, which is their true age, or maybe older if they've dieted to extremes and/or indulged in plastic surgery, rather than filtered and photo-shopped pictures that they've controlled for release. They can't remain in the past for ever. Newer and younger actresses and singers etc are appearing all the time, that's the cycle of life.