User blog comment:Jaadowgg/Chapter 347 Discussion/@comment-4637768-20140717014309

1) he says that since they are "emmitters" they belong to the category "emmision" and the have to put a lot of effort to "conjure" those guns. The "emission"category is on the opposite side of "conjuration" in the diagram of nen, so its really hard to do that for them. Hisoka Explains during the fight he has with Castro. Basically, Those guys are stupid and doesn't know how to use their nens efficiently.

2) There is all kinds of magicals beings in the world of HXH so i don't see why he can't not bet at least one hundred years old. I don't think he will be too old like Netero and nether like "Don Freecs" that is at least "300 years old" (speculations thoughts)