If one presumes that Strabo acquired the motivation for writing geography during his education, the latter must have been complete by the time of his next visit to Rome in 35 BC at 29 years old. He may have been gathering notes but the earliest indication that he must have been preparing them is his extended visit to Alexandria 25–20 BC. In 20 he was 44 years old. His "numerous excerpts" from "the works of his predecessors" are most likely to have been noted at the library there. Whether these hypothetical notes first found their way into his "history" and then into his "geography" or were simply ported along as notes remains unknown.