Removing backups on after x amount of days

#!/bin/bash

# This backup script will delete files in a directory defined as $bkupdir.
# It will only delete files if there is a minimum number off files defined as $filecounter
# If there are at least the minimum number of files in the defined backup directory,
# it will check the age of files defined as $daycounter.  Any files with a timestamp
# that is X days old will be deleted.

# Set the minimum number of backups that should remain
filecounter=10

# Set the backup directory to check
bkupdir='/home/sftpadmin/backups/cm/'

# Set how many days old backups must be for deletion
daycounter=9

# This variable should not have to change
bkup=$(/bin/find "$bkupdir" -type f | wc -l)

if [ $bkup -ge $filecounter ]; then

/bin/find "$bkupdir" -type f -mtime +$daycounter -exec rm -rf {} \;

 fi