Someone mentioned "oldies" on another thread, so I thought I'd give this thread a bump.
I think all the older cultivars I grow have already been mentioned by others, so I will just add that one of my "top five" all-time favorite daylilies I grow is an older cultivar, Novelty Number from 1965. It showed up early in the thread, so just giving it an addtional shout-out here.
Daylily (Hemerocallis 'Novelty Number')