A grouping of five [[horse girl]]s which, in real life, were three years old in 1998 and could potentially participate in the classics of that year (note: As the Japanese horse racing industry used the traditional age counting until 2000, contemporary sources would have referred to them as four year olds). They consist of:

* [[Special Week (umamusume)|]]
* [[Grass Wonder (umamusume)|]]
* [[El Condor Pasa (umamusume)|]]
* [[Seiun Sky (umamusume)|]]
* [[King Halo (umamusume)|]]
* [[Tsurumaru Tsuyoshi (umamusume)|]] (Implemented later)

Posts should use this tag only if at least the core five members appear in the post and are the focus. Tsurumaru Tsuyoshi is technically optional as she was implemented later but more recent images usually include her.
黄金世代(ウマ娘)