deleting carts

I am developing a shopping cart style e-commerce web site. I have a table called carts that holds users' cart items ... so one user may have several entries in this table: +----------------+--------------+------+-----+---------+-------+

| Field          | Type         | Null | Key | Default | Extra |

+----------------+--------------+------+-----+---------+-------+

| cust_id        | int(11)      |      |     | 0       |       |
| item_id        | int(11)      | YES  |     | NULL    |       |
| qty            | tinyint(4)   | YES  |     | NULL    |       |
| price	         | float(10,2)  | YES  |     | NULL    |       |
| date_added     | timestamp(6) | YES  |     | NULL    |       |

+----------------+--------------+------+-----+---------+-------+ I would like to write a PHP script that I will cron which will delete all items belonging to a user if their most recent item is over 90 days old. Is this possible? Nick