Went to a dinner last night hosted by the owners of Ch. Canon (St Emilion) and Rauzan-Segla (Margaux).
Wines poured were:
1978 Canon (Magnum)
1964: over the hill, almost entirely tertiary: leather, tea leaves, mushroom, tobacco, etc. Not spoiled, exactly, but too old IMO. Interesting but mostly for historical reasons
1978: also too old for me, but just barely. Still some secondary and even a little...