Honestly I do wonder why the 2006 horse got turned into a granny personality Umamusume lol.
AFAIK it was due to Wonder Acute was actively racing for much longer than the usual career of other racehorses, finally retiring at the age of 9 in 2015. In fact, he is also the oldest racehorse in Japan to win a Grade 1 race in the same year he retired.
Oh, you're playing a game?Switch!Splat3!PC Engine!Playing MH?Yeah...No, it's the beep... peep...It's the Game Gear these days, right?Oh my, are you beep-booping?Oh, how nostalgic!What do they call the beep-boopers in this day and age, again?Game and Watch....boop?Pretty sure.Onee-san used to play with her friends a lot back in the day, you know!Pretty sure it's the.... game...Pee-Ess-Pee, no?No...