Here are a few possibilities depending on the meaning:
* If "life one" refers to the first stage of life: You might use phrases like "la prima fase della vita," "l'inizio della vita," or "la prima infanzia" (early childhood).
* If "life one" refers to a specific first life experience (e.g., "Life One: My First Marathon"): You would need to translate the specific experience. For example, "Vita Uno: La mia prima maratona."
* If "life one" is part of a numbered series (like "Life One, Life Two, etc."): You might use something like "Vita 1," "Prima vita," or even "Primo capitolo della vita" (first chapter of life).
Please provide more context so I can give you a more accurate translation.