Varicose vein or superficial venous prominence: This is a common condition, especially in older adults, where veins become more visible and prominent due to decreased skin elasticity and possibly increased venous pressure.

Breast cancer with venous distension: A tumor could cause obstruction of venous return, leading to distension of superficial veins. Although less common, breast cancer is a significant concern in this age group.
Thrombophlebitis or superficial vein thrombosis: Inflammation of a vein caused by a blood clot, which could present with a prominent, possibly tender vein.
Chronic venous insufficiency: A condition where the veins have problems returning blood to the heart due to issues like faulty valves, leading to visible, prominent veins.

Superior vena cava syndrome or obstruction: Although rare, any condition causing obstruction of the superior vena cava could lead to prominent veins on the chest and breast area due to collateral circulation. This is a medical emergency.
Invasive breast cancer with chest wall involvement: Aggressive tumors can invade the chest wall and cause significant venous distension.
Lymphoma or other malignancies: Certain cancers can cause venous obstruction or invasion, leading to prominent veins.

Arteriovenous malformation (AVM): A rare condition where there's an abnormal connection between arteries and veins, which could cause a prominent vein appearance.
Paget's disease of the breast: A rare form of breast cancer that could potentially cause changes in the skin and venous prominence, although it's more commonly associated with nipple-areolar complex changes.
Surgical or traumatic causes: Previous surgeries or trauma could lead to abnormal venous patterns, including prominent veins, although this would typically be associated with a known history.