It says that an organism begins aging after they have reached their peak of reproduction and have passed down adaptive traits.

• Mutation accumulation - This theory presumes that random mutations accumulate later in life.
• Antagoni...

• Wear and tear theory - cells break down and become damaged over time.
• Genome instability theory -aging happens because the body loses its ability to repair DNA damage.
• Cross-linkage theory - agin...

• Telomere theory - Telomeres protect the ends of your chromosomes as they multiply. Over time, telomeres shorten, which is associated with disease and aging.
• Programmed senescence theory - Cellular senescence occurs when cells sto...

Aging can be categorized into two types and due to two types of factors, intrinsic and extrinsic.

• Intrinsic aging is a genetically predetermined process that occurs naturally.
• Extrinsic aging is a result of outside ...

In most parts of the world, women live longer than men . This is due to several biological, social, and environmental factors.

• Estrogen is the female sex hormone, and has been found to have anti-inflammatory and immune-boosting effects, which may protect wom...

• Advanced glycation end products (AGEs) - AGEs develop when fats or protein are exposed to sugar. High levels may lead to oxidative stress, which speeds up aging.
• Heat shock response - Heat shock proteins protect cells from stress,...