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.
At one year a cat is about equal in development to a human at age 15. The cat is an adolescent, approaching adult size but not yet fully grown, capable of mating but not likely to be mature enough for really effective parenthood, still kittenish in some ways but becoming more like an adult in other ways. At age 2 a cat is about like a human at age 23, all grown up and established in young adulthood. After that cats age about four times as fast as we do, so you can add four equivalent human years to each additional year of feline age. That makes a cat at age 3 about equal to a human of 27, 4 is like 31, and so on.