Remove Files Older than X days

Remove File older than 30 days:

find /path_to_file/ * -mtime +30 -exec rm {} \;

Remove File older than 7 days:

find /path_to_file/ * -mtime +7 -exec rm {} \;

Remove Specific file type older than 7 days:

find *.xml -mtime +7 -exec rm {} \;