Most of the deaths are not due to aging. The biggest killer, in the west, somewhat less so in Asia, is calcium overload. Basically, you need two atoms of magnesium to handle each atom of calcium. Our RDI is wrong and was determined in such a way to not allow the body excrete more than it absorbs, so once you stop growing and your bones fill up, it starts ruining your body both by calcifications, and by draining magnesium from tissues (as it is used up in attempts to excrete the calcium, but there isn't enough) This usually kills you by hardening your veins, which get consequently ripped apart by the pulse. When the wrong vein tears inside your hear or your brain, you die.

Copper deficiency is another. Copper was mistakenly (see the RDI for animals and the amounts used in feeds) labelled a toxic hevy metal, while it is a necessary nutrient, which is probably needed in larger amounts than iron is. When a protein is missing a copper ion where it's supposed to be, it's prone to collapse, causing amyloid diseases like alzheimers. (this is also the reason why copper bowls is needed for good quality whipped eggs, since it fills up the missing copper sites) Excess zinc makes it worse by depleting copper; fructose may also deplete copper, but that was only proven in animals, but not humans; it's possible that apes are immune.

Iron accumulates in the brain and body, and high intakes may prevent the absorbtion of other nutrients, such as manganese.

Other nutrients may be needed, like cobalt (outside B12) or vanadyl. Zinc excess also possibly makes those worse.