April 1999: Aoi-tayuu in 1999, age 12, debuting as the Furisode-tayuu of the Wachigaiya okiya, most likely during their April tayuu-dochu.
Source: https://twitter.com/ayaka8700119/status/1443094324153962498?s=20&t=tW6PnF5VMMye4Q8ok3Tu-g