I got 24 15s and 18krms in my daily driver doing like 157db @ ~30hz legal on music. I crank that thing up every time I get in my car and my hearing is just fine. I have quite good hearing actually.
i've listened to 140 dbs all day and my hearing is just fine as well. Granted, it is nothing close to yours, but still. I think it is all in people's head that bass destroys their hearing.
On that same note though, I had a firecracker detonate about a foot from my head and I lost my hearing for about 20 seconds. It took around 5 minutes before I could comprehend speech, and my ears hurt for the next two days. I measured the same firecracker detonation with my Kriss Spl Meter (extremely accurate), and it was a 150.7. So 150.7 dbs from a fire cracker >>>>>>>>> then 155 @ 30 hz.