At this time in 2012:
The oldest one I grow is....
'Gentle Shepherd' Yancey 1980
'Summer Wind' Bryant-E. 1982
The next two oldest I grow are after that are.....
'Love or Else' Hanson-C. 1998
'You Look Marvelous' Rice-J. 1998
All the other DL's I grow are from 2001 and later after these three.
I used to grow approx. 400 DL's, but cut back a lot! I had a lot of older ones then. I tend to grow the taller spidery ones now.