Why do old people (especially old women) stare at me in public like there is something wrong with me?

I don't have weird hair, I don't dress weird. I have long hair (not colored), I wear skirts or dresses that goes past my knees with pants under, I wear shirts with long sleeves, I don't wear tight clothes, I do not wear makeup and I don't have an abnormal face, it's pretty average, maybe below average. So why do old people stare at me like there's something wrong with me?
Why do old people (especially old women) stare at me in public like there is something wrong with me?
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