On Linux, you do not need perl: 
find $dir -mtime +$age -name '*\.(gif|jpeg|pdf|doc)' -delete

[download]
There is a windows equivalent at http://unxutils.sourceforge.net/. However, as the esteemed corion has stated, File::Find::Rule will perform the same function.

In reply to Re: Deleting files of a specific extension for dir by Illuminatus
in thread Deleting files of a specific extension for dir by Anonymous Monk

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