In that 60-69 group, Ughh, an age poll:( But I don't feel it! ... yet
Study of Art, History and Culture now occupy most of my time and ALL of my money. There is enough to learn about Nihonto to occupy several lifetimes and still fall short. I've found the same with any pursuit once one digs under the surface.
Most difficult for me so far is the terminology- however it does seem slightly easier than its counterpart in the Indonesian cultures.
Robert D