Alfred was born about 1874. He passed away in 1965.
Sources
Australia, Tasmania, Miscellaneous Records, 1829-2001, database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKYT-CY9V : 9 March 2021), O Keen in entry for Alfred Alder Keen, 22 Feb 1965; citing Cremation, Tasmania, Australia, Tasmanian Archives and Heritage Office, Hobart.
"Australia, Tasmania, Civil Registration, 1803-1933," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q27M-V5PM : 13 March 2020), Joseph Keen in entry for Alfred Alder Keen, 30 May 1874; citing Birth 30 May 1874, Kingston, Tasmania, Australia, line #125780, Archives Office of Tasmania, Hobart; FHL microfilm 7,368,120.
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DNA Connections
It may be possible to confirm family relationships with Alfred by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Alfred: