Hi everyone:
I spoke with a friend who's got a PhD in Economics and he told me that I need to make a "time to death" graph, it is done in hospitals for analysis of whether one treatment leads to less mortality or not, and it is used by engineers to determine time to failure, etc...
So it can be applied here... the "time to failure" is the time from when you were baptized to when you came out. It can be compared between decades...