Until recently I felt that
Eleanor was an old lady's name too, but now I'm really liking
Elly as a nn so
Eleanor has been sounding nicer and younger by the day :)
Maybe you could try to get him on board with
Nora first, and then explain why you'd like the full name to be the official one?
Evelyn is a former favourite of mine that I don't like so much anymore because
Eve,
Eva,
Ava, have gotten more popular, and I was always more sold on the those. I still like it's alright though.