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.
The general consensus is that at about age seven a cat can be considered middle-aged, and at age 10 and beyond - old. It was once generally thought that one year in the life of the cat was equivalent to seven years of a human life. A new scale of equivalents is now recognized: after the first two years, the cat's life proceeds more slowly in relation to human life and each feline year is approximately four human years. Use the chart below to determine your cat's age in relation to a human's.