Unlike many other products out there today, software doesn't have a best before date on the box and smelling the CD/DVD's to see if it is still fresh will only get you some strange looks. In many cases you probably don't even have a box or a CD/DVD as you downloaded the product from Passport Advantage. How are you supposed to know that a product is going out of support?
The IBM Software Support Lifecyle web site holds the key to that freshness
Besides explaining the Lifecycle policy you can also view when IBM products GA'd and their End of Service dates. Have a look at the site to see which of the products you own are coming close to their end of support date. This way you will have time to make decisions on what to do next. Perhaps migrate to the latest version or purchase a Service Extension. Either way, don't forget that everything these days has a best before date, from cereal to software be aware.