The Free-Radical Theory of Aging

Since the dawn of civilization, humankind has been intrigued with the intricacies of life, growth, and death. It’s not surprising that at least 3 well-known theories of aging exist, each of which may interrelate with one another. The Free Radical Theory of Aging is the most recently conceived model, developed by Denham Harman in the mid 1900s. According to Harman’s aging model, the body’s continual cellular reactions produce highly reactive byproducts, called free radicals. Free radicals inflict oxidative stress, which over time leads to cellular damage and death. Most recently, modern medicine has attributed a number of illnesses and conditions to oxidative stress, ranging from skin cancer to hair loss.
https://en.wikipedia.org/wiki/Free-radical_theory_of_aging

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