Why Your Lashes Thin After 35 (And What Actually Helps)

If you have noticed your lashes looking shorter, sparser, or just less there than they used to be, you are not imagining it. And you are not alone.

After 35, lash thinning is one of the most common and least discussed changes in how we age. Here is what is actually happening, what the beauty industry gets wrong about it, and what you can realistically do.

The biology is straightforward

Your lashes follow a growth cycle with three phases: anagen (active growth), catagen (transition), and telogen (rest and shedding). Each lash lives about 3 to 6 months before falling out and being replaced.

As you age, two things change. First, the anagen phase gets shorter, which means each lash has less time to grow to its full length before it stops. Second, the rate of replacement slows down. Fewer lashes are growing in at any given time, which means lower density overall.

Hormonal shifts, particularly the gradual decline in estrogen that begins in your mid-30s and accelerates through perimenopause, play a significant role. Estrogen supports the anagen phase. Less estrogen means shorter growth windows and thinner individual lashes.

What does not work (despite the marketing)

Lash growth serums. The most effective ones contain prostaglandin analogs, which are the same compounds used in glaucoma medication. They can genuinely extend the growth phase, but they come with side effects: eye irritation, darkening of the iris (sometimes permanent), and discoloration of the skin around the eye. For most women, the risk-benefit calculation does not make sense for a cosmetic improvement.

Biotin supplements. Unless you have an actual biotin deficiency, which is rare, supplementing has no proven effect on lash growth. The studies showing benefits were conducted on people with deficiencies, not the general population.

Mascara layering. Piling on more coats does not replace what is not there. It adds weight to thinner lashes, which can actually accelerate breakage and fallout. The mascara is not the problem, but it is not the solution either.

What actually helps

Gentle makeup removal. This is the single most impactful habit change. Rubbing your eyes to remove waterproof mascara physically pulls lashes out of the follicle prematurely. Use an oil-based remover, press a soaked pad against your closed eye for 30 seconds, and let the product dissolve the makeup before wiping. Never rub.

Castor oil. The evidence is mostly anecdotal, but the mechanism is plausible. Ricinoleic acid in castor oil may reduce inflammation around the follicle and improve hydration. It will not grow new lashes, but it may help existing ones stay healthier for longer. Apply a small amount to your lash line before bed.

Strip lashes. This is the immediate solution that most women over 35 have dismissed because of how the product is marketed. Every strip lash brand targets young women with dramatic, full-glam styles. If you have tried them and thought they look ridiculous on you, the lashes were wrong, not the concept.

Natural strip lashes, the kind designed to mimic your actual lash pattern rather than create a new one, can add exactly the density and length that aging takes away. The key is finding styles short enough and sparse enough to be invisible. That is what we built Sotto to do.

The bottom line

Lash thinning after 35 is biology, not a failure. The beauty industry has mostly ignored it because their target demographic has not experienced it yet. Serums carry risks. Supplements mostly do not work. Good habits help at the margins.

For an immediate, visible difference with zero side effects, the answer is natural strip lashes designed for your actual eyes, not a 22-year-old influencer's.

The Sotto Starter Set includes three pairs of natural strip lashes, sensitive formula glue, and an applicator. Designed for women who have never worn strip lashes before.