There are many options of treatment including fillers to hide the veins, sclerotherapy and sometimes microphlebectomy. Check the information on the link below for videos as well.
May want to consider a combination of limited incision phlebectomy and fat injections for rejuvenation of the hands.
There are several options for treating hand veins including sclerotherapy, removal through mini incisions (microphlebectomy) or laser ablation (endovenous). My treatment of choice is a combination of laser ablation and sclerotherapy. Usually one laser session is necessary but several sclerotherapy sessions may be needed. I have been doing this procedure for over 12 years with excellent cosmetic results. Once the veins are removed then decisions can be made on fillers. The cost varies depending on the extent of the veins in each hand. I am sure that there are doctors in your locale who can solve your problem.