According to the free radical theory of aging, what substance is affected by aging and causes damage?

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The free radical theory of aging proposes that aging is caused by an accumulation of damage from oxidative stress, which is caused by reactive oxygen species (ROS) such as free radicals. ROS can damage multiple biomolecules, including lipids, proteins, carbohydrates, and DNA. However, lipids are particularly susceptible to free radical damage, as they undergo peroxidation which can lead to further damage to other cellular components.

According to the Free Radical Theory of Aging, What Substance