Paul had, at the time of his writing, never visited the Roman church in person (Rom 1:13; 15:22-29). He thus expands his salutation so as to include a creedal summary of the gospel and his apostolic calling. Presumably Paul’s intent here was to establish credibility with the recipients of his letter, whom he had not yet met with in person.
I do not believe this evidence to be decisive in favor of a non-literalist interpretation of those ages, but it does call for caution against dogmatism in reading the ages given in the Biblical genealogies literally.
The historicity of Adam and Eve is a question which strikes at the heart of the Christian faith. If the primordial pair did not exist, then the historical and biblical doctrine of the fall becomes extremely difficult to maintain.
Some may wonder why I have chosen to address this topic prior to engaging with other topics (such as the meaning of the ‘days’ in Genesis 1). I have done so because many young earth creationists consider this to be the more pressing concern, and perhaps even the strongest argument for their position from Scripture.