I got into otome games after watching the Utapri (Uta no Prince-sama) anime! I fell in love with it so much that I just had to pick up the actual game.
I started playing otome games around middle school. My junior introduced Diabolik Lovers to me and I started to get interested in otome games (I'm also interested in voice actors so I was easily introduced to this)
Around junior high? I think. Most likely out of curiosity since i mostly dwell into reading novels, mangas and stuff. But yeah the total lock it started aroung early 20s :' D