How long can an adult Tamagotchi live before dying of old age in Tamagotchi M!X?

[Ninomitchi]

As the title say, could someone tell me how many days can a Tamagotchi stay alive in the M!X before passing of old age? Since I started to play with it I’ve usually married my tamas as soon as they become adults, but I fell in love with my last tama (she’s so cute!) so I’d like to keep her & play with her for some time before marrying her, but I don’t want her to die and stop my family’s generation...

 

[Jhud]

They dont. Since the iD, color versions no longer have dying of old age as a feature. However, pretty sure there is still a care mistake limit, i.e. after a certain (high) amount of care mistakes your character might die.