There are several synonyms that can be used to describe the phrase "lived in the past". One such term is "nostalgic", which refers to a sentimental longing for the past. Another option is "outdated", which implies that something is no longer relevant or useful in the present due to its antiquated nature. "Antique" also fits the bill as a synonym, as it refers to items or ideas that are old and typically of historical value. "Retro" is another choice, indicating a trend or style that is inspired by or reminiscent of a bygone era. Ultimately, these synonyms all imply a connection to a time period that has passed, evoking feelings of sentimentality or obsolescence.