Varicose veins can happen at any age, especially in your 20s, even though the condition is more likely to manifest during or after middle age. While advanced age is often associated with varicose veins, ageing is only one contributing factor toward venous disease development. There are many causes of venous disease, many of which are related to your lifestyle such as pregnancy, being overweight/obese, sedentary lifestyle, been on bedrest for sometime, wear constrictive clothing or high heels regularly. Certain medications, like hormonal birth control pills, can also increase the risk of developing varicose veins in your 20s, even if you’re an otherwise healthy person.