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Hardly anybody wears the same size of shoes in adulthood that they wore in high school and college. The reason: The arches of your feet fall over time, causing your feet to spread and widen. Most podiatrists estimate that your feet can increase by an entire size or more between your teens and 30s or 40s. So do yourself and your feet a favor by getting properly sized by a knowledgeable shoe salesperson to make sure you’re wearing the right size of shoes.