The most crucial factors for an extended life , I think, are partly in the genes; number two is lifestyle, which includes healthy diet and typical exercise. I go, run and swimming every day. However, I think too much workout is also detrimental because of over-stress; often those who exercise too several hours per day die early.
The good point about’Arrow’is we never claim never on the show. Preferably the show will have a nice long life , and all types of things can potentially happen.