, the gender distribution of the population was 47.9% male and 52.1% female. The age distribution, , in Marmorera is; 2 people or 4.1% of the population are between 0 and 9 years old. 4 people or 8.2% are 10 to 14, and 4 people or 8.2% are 15 to 19. Of the adult population, 2 people or 4.1% of the population are between 20 and 29 years old. 5 people or 10.2% are 30 to 39, 8 people or 16.3% are 40 to 49, and 9 people or 18.4% are 50 to 59. The senior population distribution is 9 people or 18.4% of the population are between 60 and 69 years old, 4 people or 8.2% are 70 to 79, there are 2 people or 4.1% who are 80 to 89.