When L and Soichiro are surveying the Yagami household L says. "When I was young I did strange things too", which indicated that he is considerably older than Light was at the time (17). However he is able to pass off as a student in Light's final exam. He was old enough, clearly to have been training Near to be a detective for what could have been near's whole life (13) so just how old was L?
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1The same question is present in the Anime and Manga Stack Exchange, check this out! :)– IkarosFeb 8, 2016 at 16:14
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@Ikaros Just appeared 9 hours late there :p– Ankit Sharma ♦Feb 8, 2016 at 16:30
1 Answer
L's age was not mentioned in anime but in the prequel light novel Death Note Another Note, his age was mentioned as 22.
I don't have screenshot of night novel with me now, will try to come up with it if found any.
So his age in the main Manga/Anime is speculated to be 24-25. Same guess is present in deathnote.wikia.com.