well... here he said he never revealed his real age...
http://www.mangago.zone/read-manga/crystal_harem/mf/v01/c002/19/
time lapse maybe?
in the beginning he said he was turning 30.
that is what i mean... he never revealed his 'real' age, so maby that was a lie.
In the same way that S&M mama was only 20.
10 Years ago, Tomoyoki was 20, and from the photo it looks like they were about 8-to-10-ish years apart. So the detective should be around 38-40.
one minuet is he not turning 30 in the first chapter? why does it say he is turning 40?