The mystery that is Braum.

Braum is a champion that exists to be the perfect rendition of the "protector" role. But where exactly did he come from and, more importantly, how old is he? We know that he came from the Freljord, and that he is an old man, but exactly how old? In his champion teaser trailer and from the "Tales of Braum" you can see that he has existed long past the regular human lifespan of that world. In his lore, an old woman tells her young granddaughter the stories of Braum passed down from HER grandmother. Something has been keeping Braum alive for possibly thousands of years, and we have yet to figure out what exactly it is. It most likely has something to do with the magical shield he uses as a weapon and a protection tool, but we have no real concrete answer from Riot. What I want to know specifically is: How old is Braum really?