Today I drank the last bottle of the first batch of stout my friends and I brewed, back in late 2013. I posted about this same stout on February, and today I drank it so I could know if the aging resulted something.
The beer produces a subtle scent, dark-beige foam that fades quickly but sticks to the glass. The taste isn't as strong and bitter as a stout should be, but it's drinkable, with hints of coffee and a very subtle hint of chocolate.
To sum up, aging didn't do much difference, and this stout isn't as good as the most recently brewed, but since it was our first stout, I'm happy with it. :)