The simplest way to remove files older than $NUMBER of days..

Dry run (files will be NOT deleted, you will see a list with files older than 100 days)

1

find -mtime +100 | less

Another dry run, see what would be delete:

1
2
3

find -mtime +600 | xargs echo rm
rm /var/log/squid3/access.log.0
rm /var/log/squid3/access.log.2

Finally if you decided to remove the files – the final command to delete them:

1

find -mtime +600 | xargs rm