thank your for your question.
The rule you maybe have heard about regarding the age of 30 is only relating to FREE study-membership when you still study.
When graduate/finish study there is no constraints wheather you are below or over 30 years.
But as new graduate it is very important that you apply for membership NO LATER than 2 weeks after ending study.
But if you have less than 6 months left you can already now apply for membership under the rule for new graduates.
Remember when applying to mention that you want to have the benefits for new graduates.