Best way to delete time stamped data?

Hello.  I have a table that contains time stamped data.  To delete rows 
that are over 90 days old, I do this:


DELETE FROM ONLY richtable WHERE trxdate < current_timestamp - interval 
'90 days';


This works great.  But I was wondering if there is a better or more 
compact way to go about it.  (this method feels "clunky" to me)

Thanks.

-Kyle