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The development of varicose veins is influenced by several factors, including heredity, pregnancy, and previous thrombosis. Heredity plays a significant role since individuals with a family history of varicose veins are more likely to develop them. Pregnancy increases the volume of blood in the body and puts additional pressure on the veins in the legs, which can lead to varicose veins. Prior instances of thrombosis can damage the veins, causing them to become weakened and thus more prone to the formation of varicose veins.

In contrast, young age is typically not considered a factor that contributes to the development of varicose veins. While it is possible for younger individuals to experience varicosities, they are more commonly associated with older age due to the cumulative effects of risk factors over time, such as increased pressure on the veins and loss of elasticity. As a result, being younger would generally be seen as protective against the development of varicose veins compared to the other listed factors.