Mine blew around 4.7. I was in the waiting line for the magic "5.0" and never made it. Granted, that is not a normal circumstance and what's more confusing to me is that I was not bicuspid and yet, here I sit with another one in my abdomin at 3.6. Wanna talk about sick of it all?
Looking back, in November of 94 while getting ready for work one morning, chest pain hit me hard out of the blue. I went to the ER thinking it was my lung disease acting up again, but this pain was different. Sitting in the bed in ER, it started to hit again. I hit the nurse button and the nurse came in. I told her it was happening again and asked if she could see anything on the heart monitor. She said no. I had a battery of tests and later that evening, my Cardiologist came in and told me that I had an aneurysm 4.5 at that time. Corrective action would be taken if or when necessary.
Thinking it all through now, I'm betting that pain was the beginning of the dissection and it just totally let go in March of 95.