Timestamp interval question

Hi:

I'm relatively new here so excuse me if I sound dumb.  I need to know if
(I'm pretty sure it is) it is possible to compare an old recorded timestamp
with the current timestamp and if the old timestamp is say 30 days old,
have that entry deleted?

I'm using 7.0.3 if that matters.  Oh, and I'm using Perl DBI so if there
are any specific issues I would appreciate any info.

Thanks in advance.

Aaron Cline