Deep vein thrombosis ever seen in anyone under age 20y?

DVT: Yes. However a work up for an underlying medical issues may be necessary.

Yes: Dvt can affect any age although it is more common as one gets older. Young patients can develop DVT in situations where they are immobilized, bedridden, in cast, etc. Or if they have clotting abnormalities making them prone to deep venous thrombosis.

Venous Thrombosis: Deep venous thrombosis can occur at any age. If a young patient under 20 had DVT, consider workup for hypercoagulable / hematologic disorder. Also predisposing factors could be congenital venous abnormality, varicose veins, trauma, certain medications, or prolonged immobility. If suspect then check venous ultrasound or D-dimer. Consult with a board-certified vascular specialist as well.