Manga featuring protagonists between the ages of 30 and 40.
Part 2: https://myanimelist.net/stacks/30548
Manga, 18 vol, 1994
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Manga, 11 vol, 2017
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Light Novel, 10 vol, 1996
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Manga, 1 vol, 2019
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Manga, ? vol, 2011
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Manga, ? vol, 2017
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Manga, 8 vol, 2005
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Manga, 11 vol, 2010
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Manga, ? vol, 2020
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Manga, 22 vol, 2009
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Manga, 12 vol, 2015
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Manga, 10 vol, 2017
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Manga, 4 vol, 1999
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Manga, 5 vol, 2009
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Manga, 5 vol, 2019
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Manga, 1 vol, 2018
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Manga, 10 vol, 2013
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Manga, 7 vol, 2018
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Manga, ? vol, 2013
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Manga, 4 vol, 2020
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Manga, ? vol, 2016
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Manga, 1 vol, 2009
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Manga, 3 vol, 2018
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Manga, ? vol, 1984
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Manga, 5 vol, 2021
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Manga, 3 vol, 2007
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Manga, ? vol, 2017
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Manga, 10 vol, 2005
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Manga, 1 vol, 2020
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Manga, 4 vol, 2020
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Manga, 13 vol, 2011
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Manga, 1 vol, 2016
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Manga, ? vol, 2019
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Manga, 2 vol, 2014
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Manga, ? vol, 2019
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Manga, 1 vol, 1992
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Manga, 8 vol, 2014
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Manga, 17 vol, 1983
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Manga, ? vol, 2019
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Manga, ? vol, 2017
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Manga, ? vol, 2019
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Manga, ? vol, 2017
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Manga, 4 vol, 2018
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Manga, ? vol, 2021
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Manga, 1 vol, 2019
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Doujinshi, 5 vol, 2012
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Manga, ? vol, 2022
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Manga, 3 vol, 1989
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Manga, 5 vol, 1995
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Manga, ? vol, 2022
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