You could just have him control or slow his aging through magnetism
Some practitioners are even claiming it can promote anti-ageing. Magnet therapy is a system based on the idea that our bodies form an electro-magnetic field that responds to the healing power of magnets. This is because iron makes up about four per cent of our blood content and every ion - or atom - contained in our cells produces an electrical impulse. These three elements make up our bodies own electrical magnetic field.{2} This means when the north side of a magnet - which is negative - is placed on an unhealthy part of the body, it draws fresh oxygenated blood to the area of complaint - which is positive. This creates a two-pronged result. As magnets are alkaline it counteracts any acidity in the body caused by disease. In addition, fresh blood helps to remove any acidity from the body which, in turn, accelerates healing.