To find files than are older than a certain time in any Linux or UNIX system, you can use the find command with either the -mmin or -mtime argument. The -mmin argument lets you specify the time in minutes, while -mmtime specifies the time in days. After the argument, you give it the time, and you usually have to preceed this with a + sign (though some systems may not require this).

Some examples will make this clearer.

To get all files in the current directory that are older than 2 days:

find * -mtime +2

To get all files in the current directory that are older than 1 hour:

find * -mmin +60