Reinhardt
huh
How hard are Magebane to get then?
They're not that hard to obtain. Rather it's the process of crafting them into items that's extremely difficult. Alone, Magebane are just simple material that does nothing. But when they are mixed/crafted into different items, then they gain become extremely useful.
That being said, obtaining crafted Magebane items are very pricey, despite being sold exclusively in illegal markets.
And do mages in general have extended lifespans, presumably in Merlin terms of his long life, can a mage live that long or do they age like normal humans?
They age like regular humans. However, there are ways for them to prolong their life, and it involves various kinds of highly complex magecraft. Of course, in the current time, this circumstance is extremely rare. 1 out of a billion mages have a small possibility of being able to know such things, but being able to utilize them is yet another matter of minuscule possibility.