Sounds good. I was leaning heavily towards extending them since they are all 750mls and should all be long lived.
I was just working in CellarTracker double checking some of my drink by dates as a result of reviewing these ports. I've accidentally purchased and laid down some wines that won't be ready to drink until I'm 83 years old! Needless to say I need to keep a better eye on that. Matter of fact, looking at what I drink versus buy I'm getting seriously close to the point of never buying another bottle of wine again. Nothing more than simple daily drinkers like Chiantis for pasta night and Spanish garnachas for tapas night.