The seventies are where two changes meet, and conveniently they point the same way.
The first is anatomical. The skin of the eyelid and under the eye becomes genuinely thin and mobile — thinner than it was even a decade ago, sitting on a muscle that moves constantly, with less moisture retention. The practical consequence is that this area now tolerates very little product. Concealer that was fine at 60 creases at 72, powder that was acceptable now defines every line, and the honest answer is frequently less product rather than a different one.
The second is physical. For many people in this decade, joints, grip strength and close vision have changed enough that which products are usable becomes a real question alongside which are flattering. That is not universal and it is not a decline to be managed — it is a specification change, and the industry has simply never written it down.
The convenient part is that the two changes have the same answer. Fewer products in simpler formats both suits the skin and reduces the physical demand. A stick or compact base has no dispensing step and sits well on dry skin. A wide-applicator concealer needs fewer strokes and puts less product on thin skin. A brow gel needs one stroke rather than twenty drawn hairs. A tubing mascara removes with warm water rather than solvent and rubbing.
So this page is a four-product routine, with every product chosen on handling as well as finish. And one note worth stating: four products is a finished face, not a reduced one. A tinted base, concealer in two places, a brow and a lash line is a complete result, and it reads better on seventies skin than a seven-product routine does.