If both beta globin genes code for the sickle protein, the person has sickle cell disease. Sickle cell disease is determined at conception, when a person acquires his/her genes from the parents. Sickle cell disease cannot be caught, acquired, or otherwise transmitted.
For every year of the cat's life after age 2, one cat year equals approximately 4 human years. This is based on how cats mature - for example at around 10 - 11 human years most cats start to slow down quite a lot... This is when they're getting to about 60 years old in Kitty terms.
Cats develop a lot in the first 2 years of their life. The first cat year is the equivalent of 15 human years; the second year counts for another 9 human years. By the time the cat is 3 years old, his age is the equivalent of a 32 year old human. The following years will each count as 4 human years. So, a cat that lives to be 12 (which is the average cat life span), is like a 64 year old human.