CCA is a lifetime certificate, unless you didn’t fly with a commercial airline for more than 5 years.
In this case, you will have to pass an examination again.
However, if you have worked as a cabin crew for at least one year, you will be able to enrol this accelerated 6-days training course including the examination.
This accelerated course is also available to experienced cabin crew who have worked for a commercial airline in a third ICAO country for at least one year and are still active as cabin crew.