I have only supported Juve for a few years. Always had sympathies for the team, but only started watching Juve regularly when Zlatan joined. After a few months I didn't care about him, just the team.
I was actually a Lazio fan when I was 8-12 or something like that. They had a Swedish manager, and the first Serie A game I can recall watching was Lazio - Inter. Lazio won 2-0 or 3-0. Mancini and Caseraghi playing in attack.