[CBauer]

I received a 3L bottle of Angoves Classic Reserve 1999 Shiraz and was wondering if I could put it in my cellar to drink another year or should I drink it now? I've heard that you can only store certain wines which get better with time. True?

[Curlyben]

Depending on how it's been stored really depends on how long it will last.
A wine stored in optimal conditions will last for years.
You need constant low temperature (10-12 C), lack of light and vibration, as a starter.

Also the bigger the bottle the longer it will last, compared to a normal 750ml size.

All that being said this wine will be drinking fine now, but should last for a further 5 years easily, assuming the above points.