He was 78 years of age when he became pope.
Popes do not elect popes. Popes are elected by the cardinal electors.
Popes are elected in the Sistine Chapel.
Popes are not assigned, they are elected by the College of Cardinals in a secret conclave held in the Sistine Chapel.
The Sistine Chapel
Yes, there have been several popes that were related - one father and son and several popes had nephews who were elected as pope.
Which of the 266 popes are you referring to? Please be specific.
Yes, they had many differences on matters of authority and doctrine. Some Popes were even excommunicated by Church Synods (or Councils) and other rival Popes were elected in their place, called Ante-Popes.
Illiterate people cannot be elected popes.
For lists of the oldest popes at election and oldest popes at death, click on the link below.
If anything, Popes get their wishes fulfilled by actually becoming elected and accepting election in papacy. One can imagine this would be a biggest wish for any of our popes through history.
Old age
There have been 15 popes named Benedict. Please be specific.