Tsk. Well, perhaps it says something very positive about your DH - 40+ years of marriage have obviously led him to an enlightened space where he feels able to explore and embrace his feminine side ... obviously repressed because no doubt, generationally he would have been gender- stereotyped and deprived of the opportunity to find his true self in earlier years.
Incidentally, I think it was the wonderful John Peel who, in the early noughties dryly commented on the concept of a 'gap year' being needed to 'find yourself' with a remark along the lines of 'I found myself in a caravan in Yarmouth' or something similar. 
The ' grumpy old woman' in me, that hadn't been aware of this re-naming trend before reading your post, sees it as symptomatic of a generational trend to be evermore self-orientated / self-obsessed about personal fulfillment.
P.S. I don't think I will be choosing a new name, but I do think it highly likely that I will start wearing purple and learn how to spit as two of my 'new things' when I am sixty ..