Back in April '97 when my son was born a friend boxed up an 18yr old (I think), single cask bottle, which I believe has been bottled that week. Even I do not know what it is because it has been carefully sealed.
I have put it away in a box with other stuff that was "of the time". With it being a single cask bottle, the price should go up as well, so if he can't drink it, he should be able to sell it.
FWIW in his "box for when he's 18" are:
- Promo items from the latest films
- All the newspapers and TV mag from the day of his birth
- The "in" toys (tamagotchi etc)
- first pair of shoes
- No.1 Music single/album
plus other stuff.
The only thing I didn't get was the "Now thats what I call music..." CD that was out at the time.