Cronjob to delete folders & files older than 3 days?

I have 4 cameras that automatically store .jpg & .avi in seperate folders for each camera. I wish to use cron to delete folders & files after 3 days. Can someone please point me in right direction. Setup is folders ftpcam/cam1/cam2/cam3/cam4 New daily folders are generated in these folders. I wish to delete all folders & files over 3 days in these folders. tried find /home/*****/public_html/ftpcam/{cam1,cam2,cam3,cam4}* -mtime +3 -exec rm {} \; But doesnt seem to work. Any help much appreciated Getting this error rm: cannot remove `/home/bumsrush/public_html/ ftpcam/cam1/20180327': Is a directory rm: cannot remove `/home/*****/public_html/ftpcam/cam1/20180325': Is a directory rm: cannot remove `/home/*****/public_html/ftpcam/cam2/20180326': Is a directory rm: cannot remove `/home/*****/public_html/ftpcam/cam3/20180325': Is a directory rm: cannot remove `/home/*****/public_html/ftpcam/cam4/20180325': Is a directory