Advice on wine that will last 25 yrs?

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Hi All,

Any advice would be much appreciated - I have a bridal shower to attend at the end of the month and I was asked to buy a bottle of wine (red or white) that the couple can open on their 25th wedding anniversary. I haven't bought a bottle of wine that's lasted more than a week without being consumed - hee, hee!!

Any recommendation on a wine that will keep that long? and one that wont break the bank?

TIA