Mealworm beetles can live as short as 2 months and sometimes mealworms can live as long as 10 or 15 years.
Mealworms spend one to two weeks as pupae once they are big enough and then after that happens the mealworms emerge as darkling beetles and from then they can live for 2 months to as long as 15 years.
It all depends on the mealworm beetle just like humans can live longer than others mealworm beetles and other insects can live different amounts of time.
But some mealworm beetles can live up to 15 years.
The lifespan of the mealworm beetle can also depend on the species and environmental factors such as climate and food availability.