I would not recommend injecting these veins. In the future, should you need an IV, these veins would be sclerosed and not useful. A better idea would be to have filler injected into the back of your hands to cover these veins. When you were younger, these veins were present, but now, with age, the subcutaneous tissue overlying the veins has diminished, causing the veins to look more pronounced.I prefer to use Radiesse.
The treatment of hand and forearm veins is strictly a cosmetic procedure but it certainly can be done. I have treated many hand veins and several forearm veins. Hand vein treatment is certainly more common. I use a combination of sclerotherapy for the smaller veins and laser ablation for the larger veins. Besides the face and neck, the hands are the next area that shows signs of aging. The treatment is well tolerated with excellent cosmetic results.