I see others have already addressed your question well. My first thought was, when I read your question was mtime

Mtime prints the name and modification time (in seconds since the epoch) of each of the files.

Seemed the fastest/easiest way to "stat" the file(s) you're interested in. So I performed a search on CPAN, and found File::Find::Age, and newest-mtime. Either one of which would probably serve you well. I think using this approach may make coding your solution easier, and should also improve the speed for the results, as drilling down a filesystem hierarchy will be the bottleneck.

HTH

--Chris