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At what age does the neck start to sag?

While it can vary significantly, the loss of collagen and elastin that leads to sagging neck skin can begin as early as your 30s. A combination of genetic factors, environmental stressors, and lifestyle choices determines the timeline for each individual, but understanding the aging process is the first step in prevention and treatment. At what age does the neck start to sag is a question with a complex, personalized answer.