Excess upper eyelid skin does not cause a worried or angry look, but a drooping or sagging eyebrow does. Just think: when you try to look angry, you frown, pulling your eyebrows down.
After many years as a plastic surgeon, I concluded that drooping eyebrows are (largely) something you are born with. It explains that sometimes young patients have headaches, fatigue, and pressure on the eyes when they have low eyebrows. In most cases, the first issues arise around age 40, when ageing starts playing a role, next to the congenital component. Over the years, you have gotten used to it, and you didn't know better. The absence of the fatigue and the headaches, and the good aesthetic result of the forehead and brow lift are, both literally and figuratively, an eyeopener. In cases where the low eyebrows are linked to migraines, the forehead lift also positively affects this type of headache.