How old was Al Lewis really?

Al Lewis, Grandpa on "The Munsters" and also starring in "Car 54 Where Are You?" died Friday at the age of 82 giving Izzy another 18 points.

There is some substantial amount of debate as to the true year of birth for Al Lewis. Some sources say 1910, some say 1923. According to an interview with his family members, the 1910 date is a "story" and the real date is 1923, which is apparently backed up by official paperwork.

http://www.wa-wd.com/h_intro.asp#allewis

Q. Wasn't Al Lewis really born in 1910?
A. No, he was born on 23 April 1923. This has been documented on his birth certificate and college application. These documents were shown on an episode of "A&E Biography" in 2000. I know, he claims to have been in the circus in the 1920s and in the merchant marine in the 1930s, but he wasn't really. He lied about his age to get the part of Grandpa, and he's been lying about it ever since.