The most important factors for a long life , I think, are partially in the genes; number 2 is life style, which includes balanced diet and typical exercise. I walk, work and move every day. However, I believe too much exercise can also be bad because of over-stress; occasionally individuals who exercise also many hours daily die early.
The great thing about’Arrow’is we never claim never on the show. Preferably the show could have a great extended life , and all manner of points can potentially happen.