oh, i got it. -c was what i was looking for...
THIS_RUN=`date +%s`
FILE_TIME=`stat -c '%X' $f`
if [ $FILE_TIME -lt $(($THIS_RUN - 120)) ]; then
echo "$FILE_TIME is less than $THIS_RUN - 120"
else
echo "$FILE_TIME is not less than $THIS_RUN -120"
fi
thanks and sorry for bandwidth waste but maybe someone else will find it useful
