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What Happens to You at Age 40? A Midlife Guide

According to a 2024 Stanford Medicine study, many people experience two periods of rapid biological aging during their lives, averaging around age 44 and early 60s. These periods involve significant shifts in molecules and microbes, indicating that major changes are a normal part of the midlife experience. Understanding what happens to you at age 40 can empower you to proactively manage your health and well-being for decades to come.