Intrinsic ageing is mainly caused by what?

• A. Environmental Exposure
• B. Diet
• C. Inherited Genes
• D. Hormones

Answer: (C)

Intrinsic ageing is driven by genetic programming—the body's biological clock. Our inherited genes set the baseline pace of aging by controlling key cellular processes: how quickly cells divide, how much collagen is produced, how well antioxidant defenses work, and how telomeres shorten over time. This genetic blueprint means ageing proceeds at a characteristic rate, even when environmental conditions are favorable. External factors like environmental exposure and diet shape how aging appears (accelerating visible signs) but don’t establish the fundamental rate. Hormones can influence aging as part of internal regulation, but they operate within the genetic timeline rather than determine it. So the inherited genes are the main cause of intrinsic ageing.