Three things change around the eye and they change independently, which is why generic advice rarely lands. Lashes thin and lighten, so there are fewer of them and they hold less product. Brow hairs go sparse and often gray or wiry, so the shape you had for thirty years stops reading. And the upper lid becomes hooded as the skin above it relaxes, which moves where eyeliner and shadow actually sit when your eyes are open.
Each has a specific answer, and the answers are more practical than cosmetic. For lashes, the single most valuable switch is to a tubing mascara — a formula that wraps each lash in a flexible polymer tube rather than coating it in a wax film. It does not flake into the eye, it does not smudge under the lower lid, and critically it slides off with warm water and gentle pressure instead of requiring solvent and scrubbing. On a lash line that is already thinning, not having to rub it is worth more than any volume claim.
For brows, the rule is strokes, not blocks. A sparse brow looks sparse because there are gaps between hairs, and filling the gaps with a solid band of color produces the hard drawn-on look everybody is trying to avoid. A pencil with a tip around a millimeter or finer lets you draw short tapered marks between the surviving hairs, which reads as hair because it is shaped like hair. Keep the inner brow soft and concentrate on the arch and tail.
For hooded lids, the geometry has moved and the technique has to follow. Liner drawn along the lash line while your eye is closed disappears under the hood when you open it, which is why people end up drawing thicker and thicker lines. The answer is to draw with your eyes open, looking straight ahead, and to keep the line tight into the lash base — detail in how to apply eyeliner on hooded eyes.
What decides price in this category is mostly brush engineering for mascara and pigment quality for brows, neither of which scales neatly with cost — one of the best tubing mascaras is a drugstore product, and e.l.f.'s brow range competes with brands five times the price. Where money genuinely buys something is shade range in brows, particularly cool grays and taupes, which short ranges simply do not carry and which is exactly what a graying brow needs.
The mistake that costs most people the most is waterproof mascara. It is sold on not smudging, and it works, but removing it requires solvent and friction on the thinnest skin on your face — and that friction is both an irritation risk and a reason people stop wearing eye makeup. A tubing mascara does the non-smudging part without the removal problem.