I think there comes a point at which you simply have to spend more time and effort on your appearance if you want to maintain this sort of look.
Hair style and colour is important. The celebs who look impossibly young often have lighter hair to hide the greys and because it is better with our skin tone which changes as we age. Its a softer look. The layered look is also helpful because it hides hair extensions and also because it means you can chop off all the damage on a regular basis.
Eyebrow trends change and the current look is for bigger eyebrows. If you no longer have them due to over plucking I would look at microblading.
Skincare is more important. If you smoke and drink a lot and eat lots of sugar then your skin is going to look older. Sunglasses are really important to prevent wrinkles around the eye area.
You need to spend time thinking about your style and what suits/doesn't suit. Far better IMO to have a limited wardrobe of items that look really good than an extensive wardrobe of rubbish. Avoid the ageing brands and avoid the very young brands which can look just as bad. One good bag is better than ten cheap looking bags.
The stick thin look isn't particularly flattering on middle aged women. It can make us look gaunt. A bit of softness in the right places helps.
But in general yes these women have all the time they want to have treatments, facials, eyelash extensions, hair extensions, colour tough ups, massages, HiFu, microdemabrasion, hair line adjustments, laser treatments, botox, fillers, lip fillers etc.