How do they look good?
Hmm, let's see. From the top down:
Hair extensions. Not necessarily big barbie extensions, just subtle ones to add bulk. Then regular maintenance, cuts and highlights etc.
Botox to forehead and eyes. Maybe eye lift surgery too.
Filler to under eyes, cheeks, lips, chin and jawline.
Nose job.
Full set of crowns / veneers / composite bonds or a small set plus teeth whitening
Jawline sculpting / thread lift
Breast augmentation or lift
Then they'll work out and and eat very little and as a last resort get a tummy tuck, liposuction on tummy and or thighs.
Added to this, regular tanning, derma rolling, facials, massages, pedicures, manicures and waxing.
All of the above work can be done subtly. I would imagine that EVERY woman in the public eye has had most of these treatments done to a greater or lesser extent. Some will be so subtle that you think she's natural but by late forties it's pretty hard not to go without all this and still look as good as they do in bright daylight.
It's not surprising really. I defy any woman with money and time and whose career relies on a youthful appearance NOT to dabble in cosmetic surgery and procedures. They face a huge amount of pressure in a male-dominated industry.