I have had this same worry for some time now! I am a 23 year old female. Anytime I have a severe occipital headache, I have to say a mantra to tell myself I am not going to suffer from a ruptured brain aneurysm! If it helps any, I have read and researched (bad, I know) that in many circumstances, aneurysms seem to be related to genetics (IE. if more than 1 immediate family member has had one). So if that doesn't apply to you, you're clear!