I just want to shout this out.
I have a different vascular thingy from most of the people here (I have an AVM and we have a separate support group for AVMers) but the risks are very similar to those of a brain aneurysm. My grandfather never had a diagnosis but he lived in an age when it was impossible to even look at what is going on inside our skulls, never mind do anything about it. He had migraines and bleeds from the age of 29, was never admitted to a pension scheme as a result, suffered from dementia and passed away in an asylum in 1955, aged 61.
We are completely blessed to live in an age when these things are possible and are done very well.