How to find files in linux

Need to find files older than certain time frame? This will help, “find [dir] -type f -mtime +[24hours*n] ”
Examples,
Show files older than 7 days

find /tmp/ -type f -mtime +7

Show files older than 7 days and rm them.

find /tmp/ -type f -mtime +7 -exec rm {} ;

or if you have a large number of files

find /tmp/ -type f -mtime +7 | xargs rm