Okay, so I know that compounding atium increases youthfulness. After a certain point, since your spirit knows how old you are supposed to be, you drop dead anyway. Being that that is the case, how did TLR stay alive for so long? Shouldn't he have dropped dead?
(my theory: maybe his resonance affected his age in some weird way, or compounding investiture made a difference. Speaking of which, does burning duralumin only affect feruchemy if you are compounding?)