http://www.cmgworldwide.com/football/tittle/index.html
The proper title for a retired Major is "Major (Retired)" or "Retired Major".
Y. A. Tittle is 86 years old (birthdate: October 24, 1926).
The proper title for a retired ambassador is "Ambassador (Ret.)"
A retired judge can be referred to as "Judge [Last Name] (Retired)" or simply as "Retired Judge [Last Name]."
Emeritus is a suffix added to the title of a person retired from active service, but retaining rank or title. An example is a retired professor who has the title Professor Emeritus. A person who is retired but retains an honorary title corresponding to the position that was held immediately before retirement. e.g. an emeritus professor is a retired professor.
Professor Emeritus.
You're Only Old Once by Dr. Seuss
He was 37 years old when he retired
General Retired
Yes, because retired in this case is a part of the proper noun. Some styles allow you to not capitalize prepositions and articles, but retired is neither of these.
Daley Thompson was 34 years old when he retired from athletics. He retired in 1992.