While Nintendo has its own subsidiaries to work on its games, some of Nintendo's most popular IPs were championed by third-party companies like Sega.
In a YouTube video showing Nintendo Switch owners how to create a Nintendo Account, Nintendo of America revealed that Bowser is canonically 34 years old.
TG: “Most of us also grew up with Nintendo, likely forming a nostalgic connection with games that have long been crowned as our personal favourites. The Legend of Zelda: Wind Waker was an experience that shaped my view on open world fantasy, and Super Mario 64 changed my life like it did for millions of others. These titles have earned their place in history, and remain loved to this day for so many worthwhile reasons. We replay them and beg for remasters all while delving into their worlds time and time again because they mean that much to us. It’s a shame then that the company behind them often kicks its own sweet darlings to the curb.”