Amnesia is memory loss. It can occur from a traumatic head injury (such as from a car crash), or as the result of a virus (such as meningitis), or the result of a stroke.
Mister Ed - 1958 Ed Gets Amnesia 3-1 was released on: USA: 27 September 1962
The Betty Hutton Show - 1959 Goldie Gets Amnesia 1-22 was released on: USA: 3 March 1960
He doesn't get amnesia. However, Ryoma Echizen gets amnesia during the OVAs before his match with Yukimura
The Betty Hutton Show - 1959 Goldie Gets Amnesia - 1.22 was released on: USA: 3 March 1960
The Lucy Show - 1962 Lucy Gets Amnesia 3-4 was released on: USA: 12 October 1964
The Amos 'n Andy Show - 1951 The Kingfish Gets Amnesia 4-6 was released on: USA: 1955
The Red Skelton Show - 1951 Bolivar Gets Amnesia 7-26 was released on: USA: 8 April 1958
I'm guessing that Sly will continue to "have" his amnesia to stay with Carmelita, but that is possible.
No. Whether or not they remember the crime does not change the fact that they committed the crime.
The Adventures of Rin Tin Tin - 1954 O'Hara Gets Amnesia 3-35 was released on: USA: 17 May 1957
When someone first gets amnesia, they cannot remember ANYTHING (In some rare cases, they may not even remember how to talk.) So, no a person with amnesia does not know how old they are. However, during the recovery process they can figure it out.
Dr- Christian - 1956 Amnesia 1-28 was released on: USA: 1957