Loire white - Prunier Anjou blanc moelleux 1928 (from la Vigneronne, drunk in the early nineties) - very good
I bought two halves and a bottle of this from Adnams, and later on some more halves from Berry's broking. The two halves from Addams were sublime in the late 1980's and early 90's - colour still quite light. The halves from Berry's were noticeably alleged and colour significantly darker but were still excellent, whereas the bottle, opened with much anticipation, was totally shot; in appearance it was fine, with no signs of oxidation, but it was totally undrinkable.
Other old wines -
Red Bordeaux
Leoville Barton 1908, tried a bit under 10 years ago, was showing its age, but still definitely alive (unlike the '55 tried at the same event)
Ch Haut Sarpe 1918 tried back in the early '80s was amazingly fresh for a wine produced by a minor chateau over 60 years earlier.
White Burgundy
Meursault 1941 (Dr Barolet) drunk in the late 1980's and still showing well.
Port
Ferreira 1863 - drunk at a wine show masterclass just over 20 years ago; the wines had been shipped from Ferreira directly and the masterclass was hosted by their MD. Apparently it had been bottled considerably later than the usual 2 years and it did have a little extra wood character when tasted.
Madeira
Most of the wine I've had has been Solera rather than vintage, but I did have a 1915 vintage some years ago. No notes as it came at the end of a dinner at which we'd also had (among other things) Chave Hermitage '90, Penfolds Grange '88, Haut Brion '90, Vega Sicilia '70 and Ch Suduiraut '67...