Amos, In answer to your question, Donovan is still performing and did a tour of Australia a couple of years ago.Whilst he went on a bit about the old days, did a lot of name dropping and was (I think) a little partonising to the audience, his guitar work is still very solid and his voice is a good as ever.
All in all I enjoyed the show as did my 25year old son who had never seen him before, and knew very little about his music.
Vheers
bugsy