Justification of Life for who ?
Rom 5:18
18 Therefore as by the offence of one judgment came upon all men to condemnation; even so by the righteousness of one the free gift came upon all men unto justification of life.
The words came upon means: happened as a result, meets on one, received on one !
Is Justification of life here for all those Christ died for ? More importantly does it apply to them before they exist, before they are believers ? The answer is yes indeed, no question about it, for the teaching here of Paul and the context demand it; For if the Justification of Life comes upon the Elect in the same manner as condemnation came upon them in Adam, as it is shown in this verse as well as throughout this Chapter 5 of Romans, then it is most reasonable and agreeable to sound judgment to conclude that Justification of Life was imputed, reckoned upon all the Elect before they had a physical being or existence, and even moreso, before they believed on Him.
Now this is true and evident that the sin of adam that called upon them condemnation, was before they had a being, or an existence, for Paul writes in the same Chapter and context Rom 5:12
12 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon or came upon all men, for that all have sinned:
Passed upon here means :"passed through unto all men so no one could escape its power "
Now here Paul is teaching by Divine Inspiration how and when sin entered into the world, and by that states Death passed upon all men ! Thats because, before they had any being, in him or in his loins all his seed had with him sinned even before they had being or existence !