At what age is deep vein thrombosis more likely?

Specifics unclear. Several risk factors for deep vein thrombosis (dvt), such as immobility and cancer, increase with increased age. However, it is hard to identify a cutoff age where there is a noticeable jump in likelihood. One study indicates occurrence of DVT goes from 17 per 100, 00 in those aged 40-49, to 232 per 100, 000 in those aged 70-79. Other studies show a noticeable difference after age 40-55.
Age's a minor factor. Age is only a minor factor leading to increased risk of deep vein thrombosis. While older patients have higher prevalence, this is confounded by much more significant factors, including recent history of immobility, hospital admission, surgery, cancer, and infection. Pregnancy, oral contraceptives, hormone replacement therapy & genetic factors also increase risk.
Depends. Blood clots may occur at any age. The risk of having a blood clot may increase with age , certain medical conditions or even some medications. Genetics factors and family history of clotting disorders may also play a role in the development of clots. Surgery, pregnancy, obesity, unhealthy lifestyles or prolonged immobilization may also place a patient at risk.
Age an indirect part. As dr. Bansai said, immobility, hospital admission, surgery, cancer, and infection all increase the risk of deep vein thrombosis (dvt). Since all of these generally become more common as you get older, increasing age becomes an indirect risk for developing a dvt.