Appendicitis occurs when the appendix becomes blocked, often by stool, a foreign body, or cancer. Blockage may also occur from infection, since the appendix swells in response to any infection in the body.
A familial generation is a group of living beings constituting a single step in the line of descent from an ancestor. In developed nations the average familial generation length is in the high 20s and has even reached 30 years in some nations.
The average generation is the average age of parents at the time of birth of their children. When life span increases, so does the average length of generations. To show the extent of how life span varied over time, the average life span of the pre-Flood patriarchs was 912 years.