Getting older is weird. You're trucking along, enjoying your middle-aged life, finally feeling like a real adult, when you look in the mirror one day and gasp. "Where did those wrinkles come from?" "Is that skin on my arm…crepey?!?" "Why am I aching like that?"

Somewhere in your mid-40s, you start noticing obvious signs of aging that seem to arrive overnight. You assumed it was a gradual process that you just hadn't noticed, but it sure as heck felt like it happened really fast.

New research indicates that may very well be the case. A 2024 study from researchers at Stanford tracked thousands of different molecules in people age 25 to 75 and found that people tend to make two big leaps in aging—one around age 44 and another around age 60. These findings indicate that aging can actually happen in bursts.

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