I recently purchased a bottle of Jim Beam Black Label. This is a bourbon that I have been drinking for a little over a year. After getting the bottle home I noticed that it had been aged 8 years. All the previous bottles of this bourbon I had tried were aged 7 years.
I found a review of Jim Beam Black Label that stated that it was aged for 7 years, but also referred to an older version that was aged for 8 years.
Therefore, did I happen to purchase an older bottle that was from the 8 year stock or has Jim Beam gone back to an 8 year aged product or do they change it from year to year or finally do they sell both the 7 year and 8 year version of the bourbon?

Is one better than the other? I have not yet opened the 8 year bottle.

Anyone know?