I have encountered such age discrepancies in the two listings for my gr-grandfather, Friederick Fietz, who arrived at the port of Halifax in July 1913 and took the train across Canada where he entered the U.S. at Pembina, North Dakota. He is listed for both ports of entry, with a different age (47 and 43) at each one, even though only three or four days separate the two listings. Believe me, this has created incredible problems for my research to find his birth record in Lublin , since his name was not an uncommon one, and there are two possible births for each year (1870 and 1867) that could be his record.
I have always guessed that the discrepancy is either a recording error or language misunderstanding of some kind, but our discussion ongoing of of identity papers the makes me wonder if there is a way to find more definite information about his birth. 
I know he returned to Russia in 1916 via Murmansk, during WWI. I have often wondered if there was some way to find any passport, visa, or other records for Russian citizens returning to Russia in that time period. I know there are some Russian Consular records from the U.S. Consulate of San Francisco in the LDS library, and I at one time did look at some of those films, but these records are curiously archived by "boxes" and one needs to know more about that system. I decided when I tried using them some 15 years ago that it was going to be a very time-consuming process to sift through the materials on microfilm.  Has anyone else done any research with these archives? Might they be worth looking at more closely? Does anyone know of any other way to retrieve information that might have been on a German-Russian traveler's identity papers from the 1912-1918 time period?
Karla Walters
Researching FIETZ, BAIER, KRAMPITZ, MARQUARDT, HIRSCH 
karlann@juno.com

