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This statement "Houseflies have been used in the laboratory in research into ageing and sex determination." is not correct. This research was done with Drosophila melanogaster not Musca domestica. See  AND Theflyelectric (talk) 20:26, 8 January 2018 (UTC)Theflyelectric
It is correct. You are right that fruit flies have been important model organisms, but if you read the cited sources for the housefly (see the Science section) you'll see it has played its part too. Chiswick Chap (talk) 20:59, 8 January 2018 (UTC)