For my job site, jobs are tagged from terms of Tags vocabulary where new ones can be added. Sooner jobs expire and new arrive.
That has resulted in bloated taxonomy vocabulary with 2400 terms (or 2400 pages). I guess many remain empty for long periods.
Many tag pages simply show no classified content available which has attracted Google's Panda penalty.
What I want is removing those tags not used for any node, and automatically deleted those that have not been used in the past 3 months or so get.
Is there any simple way for doing this?