What's the most "mature" Nintendo-developed game?

[TWRoO]

DarkNight_DS said:

TWRoO said:
Mario....he's what? 26/27 now? (also begins with M)

 According to Nintendo, Mario turned 22 on September 13th

Ah, i was thinking of the original Donkey Kong game, but that would be 1) 25 years old (1983 right? [and before November]) and 2) Jumpman instead of Mario.