How do people who act like they will be beautiful forever behave?

When I was in 18 and 120 pounds, there was a career guy that wanted to date me out of physical attraction and I thought that appearance was such an unstable factor for marriage cause somebody could gain or lose 40 pounds in half a year and everything about their appearance would change. I thought other factors were less likely to change such as level of empathy for others, or intelligence, that it made no sense to base a marriage on something that might be lost in 3 months with a medical crises or a year of depression.

How do people who act like they will be beautiful forever behave?
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