Fentanyl can strike anyone, at any age, on account of the unique method by which it can be absorbed:..... through contact with the skin. ...the quantity required for the average adult to overdose and die is just 3 milligrams. Smaller still the amount required to kill a child. While many balk at the notion that merely touching fentanyl can lead to an overdose, any contact with the mucous membranes can introduce the drug to the bloodstream.....