Forget it.Hank, lets be reasonable. He asked what could he do to inherit "eternal" life. Jesus is not going to give him a solution for something he never asked about! He did not ask about extendinng his PHYSICAL life. He was not accused of committing any capital offense. You are being completely unreasonable! He is asking about obtaining "eternal life" before God by something He could do - His works!
So he was not physically dead attempting to get physical life. He was not attempting to get around a capital offence. He was asking about "eternal" life by earning it by his works - "what CAN I DO."
Oh, I see it is tit for tat? Forget I said you did not misunderstand me if that offends you. My purpose was to demonstrate that the Biblical principle is justification, in the sense of being declared righteous, is precisely what Jesus is teaching through proper obedience to the Law. The only thing that prevents that principle from being a reality is our sinfulness. However, Jesus is approaching this according to the Biblical principle and from the perspective of the Jews of his day who actually believed they could be justified by keeping the law. In essence, Christ said, yes, the law will justify those who do it, so here is the law go for it and see if you can do it. That is precisely what Saul of Tarsus did, he went for it and by going for it the Law condemned his efforts rather than rewarded them as it exposed his sinful nature.
However, the problem was not with the Law or the principle of justification by the Law for those who keep it. The problem was in the flesh which had already violated it and continues to violate it when attempting to keep it sinlessly.
HankD