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