I have a 2008 DFH 120 looking for any dark lord / or zombie dust.
The DFH head was bottled 07-08-08 almost 5 years old.
Have you tasted one of the 5 year old 120 in the last 4 years?
Nope... Only have one bottle. No idea what it tastes like. But I imagine it mellowed out some.
I did a 4 year old taste test against a fresh 120-minute. It was a different beer! It mellowed out into a rich barleywine-style beer. Here's a pic for comparison. http://i.imgur.com/IgWksJT.jpg
I also have a 4-year old bottle that I'd love to off-load as I don't much care for it. But only after OP's trade is satisfied.