Lashes change in three ways after 50 and all three argue for the same product. They get fewer, because follicles become less active. They get finer, so each lash holds less product and bends more easily under weight. And they get lighter, losing pigment in the same way hair does, which is why they read as sparse even where they are present.
Most mascara advice responds to that with volume claims, and volume is the wrong target. A thick wax coating on a fine lash weighs it down, and a weighed-down lash droops rather than lifting — so the mascara sold on volume frequently produces less apparent lash than a lighter formula would. What actually helps is definition and separation: making each remaining lash individually visible rather than trying to build a mass.
The more important factor is removal, and it gets almost no attention. Taking mascara off means working on the thinnest skin on your face, a few millimeters from your eye, usually with a solvent and some friction. Do that daily for years on skin that has thinned and you have a recipe for irritation, for lash loss through mechanical damage, and ultimately for giving up on eye makeup. A product that comes off with warm water and no scrubbing is worth more on a mature lash line than any amount of volume.
Which is why tubing mascara is the recommendation that runs through this whole hub. The formula forms a flexible polymer tube around each lash rather than a wax film on it. The consequences are all the right ones: it does not flake, because the tube is continuous; it does not smudge under the lower lid, because there is no wax to soften; and it removes by sliding the tubes off with warm water and light pressure. Whether or not it lengthens more than a traditional formula is almost beside the point.
The trade-off is genuine and worth knowing: tubing formulas do not build dramatic volume, and if you want a thick dramatic lash they will disappoint you. Tubing versus traditional mascara weighs it properly.