I believe you will find Mr. Morris is looking for information on this John Morris of Marion County. His age is noted as 36 in the 1850 Marion County Census and age 48 in the 1860 Marion County Census.

http://worldconnect.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=morris31543&id=I119

Zebedee Morris of Company D, 7th. Regt. Miss. Inf. was his son.

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John and William J. Morris of Company F, 7th. Regt. Miss. Infantry and sons of Alfred Morris were residents of Washington Parish, Louisiana.

John's age is noted as 18 and William's as 20 in the 1860 Washington Parish Census.

http://worldconnect.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=theyliveagain&id=I253