The fifties are where makeup advice written for younger faces stops transferring, and the reason is that the dominant concern changes. In your forties the complaint was longevity. Now it is texture — and texture responds to the opposite of the instinct.
Three things have changed enough to matter. Pores look larger, because the collagen and elastin supporting each opening has thinned and the opening has slackened. The surface is less even, with permanent expression lines now joined by finer lines and some crepiness. And oil production has usually fallen, so there is less natural slip on the surface and less of a lipid layer holding water in.
Put together, those mean that the amount of product on your face is now the main variable. Every extra gram has somewhere to collect: a line, a pore rim, a crepe. Which is why the instinct that works at 35 — see something you dislike, add coverage — starts producing worse results than doing less. A medium-coverage foundation across the whole face to deal with four spots makes the other 95% of your face look worse.
So the fifties routine is a subtraction. A thinner base — a serum foundation or a balm stick rather than a conventional liquid. Targeted concealer on the few places that need it. Satin rather than dewy or matte, because dewy picks out texture and matte needs a rigid film. Powder only where you actually shine, which for most people is the nose and nothing else.
This is also the decade to notice whether the products you own have become physically harder to use, because that is a slow change nobody flags. If opening a bottle or applying mascara has started to be a consideration, the easy application section is worth reading before it becomes a problem rather than after.