We know because scientists have tracked and studied them and their growth patterns. You can also visit Carol of Crabworks and meet Jon and Kate who are over 30 years old.
http://www.geocities.com/hermit_crabs/carol/
It is known that the some land hermit crab's have been kept in the home as pet's for over 30 years!
You should let it mold. It is part of life for a Hermit crab.
what is switzerlands average life expectancy
The average life expectancy in Cyprus is around 81 years.
The average life expectancy for a male in America is 75.5 years. The average life expectancy for a female in America is 80.8 years.
The average life expectancy in Thailand is around 75 years for both men and women. It has been steadily increasing over the past few decades due to improvements in healthcare and living conditions.
The average life expectancy of the world is 69.4 years.
The average life expectancy for an American female is 80.51 years. For men, the life expectancy is 75.35. The average is 77.97 years.
The average life expectancy of men in Arizona is 76.6 years. On the other hand, the life expectancy for women is 81.8 years.
The average life expectancy in Madagascar is around 67 years.
The average life expectancy of a Brazilian male is 69 years. The expectancy of a female in Brazil is 77 years.
The average life expectancy in India is 67 years old. The life expectancy in Switzerland is 85 years old. The life expectancy in the United States is 80 years old.
The life expectancy for Lebanon is about 72 years average.