The next discussion thread is here.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 84. The previous thread has passed 500 comments. Comment in the 14th thread until you read chapter 84.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14.
As a reminder, it’s often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically:
You do not need to rot13 anything about HP:MoR or the original Harry Potter series unless you are posting insider information from Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).
If there is evidence for X in MOR and/or canon then it’s fine to post about X without rot13, even if you also have heard privately from Eliezer that X is true. But you should not post that “Eliezer said X is true” unless you use rot13.
Eliezer, in an edit, just reminded me that Tom Riddle is 65 years old. And from there I got to looking that other ages. Dumbledore is 110. Bahry One-Hand and Mad Eye Moody are each at least ~120. From chapter 39, I got the impression that 150 years old is uncomfortably old (maybe 90 in muggle years) and 200 is unthinkably old (110+ for muggles). So now I'm confused again.
Where are all the old people? What would family trees look like if people really lived to be 120+ regularly? If you're a child you've got two parents, and 4 grandparents, but what about the 8 great grandparents...and the 16 great^2 grandparents...32 great^3 grandparents...64 great^4 grandparents... 128 great^5 grandparents...256 ...512 etc? Plus, imagine the number of children each couple would have if people jumped from 40 fertile years to 80. I could buy that with older ages, people would wait longer to have kids (In canon they mention that it was slightly unusual for people to be having children at 20 years old). That would explain why there aren't 7-10 generations of family at the reunions, but on the other hand, I wouldn't expect Wizards to be big fans of birth control or abortion. Plus, that doesn't explain where all the grandparents are.
So many things don't match up. In retrospect, it seems odd for Lucius Malfoy to be alone in front of the Wizengamot when he ought to have four grandparents roughly Dumbledore's age and two parents at around Voldemort's age (though canonically his father dies of an old age disease prior to 1996...what?). That hearing doesn't seem like the kind of event his family would skip out on. The bureaucracy and government structures don't make sense either. When I first read the story, I thought the Ministry and other power structures were dominated by old fogies, but now I realize that they're damn near children! Plus, education for 7 years makes no sense if you expect to live another hundred; muggles spend 1/5-1/6th of their life in education, but wizards only 1/15th. And heck, how does Harry go to his muggle relatives when he ought to have dozens of still surviving wizard relatives up higher in the family tree?
I suppose the real answers to these questions is that JK Rowling didn't think through the societal implications of living 150+ years old and HPMoR adopted it rather than having to overhaul the entire canon. But that's not quite a satisfying answer. So, can anyone think of any thoughts or theories on how the magical world looks the way it does with regard to age? I'd rather save my suspension of disbelief for birds of fire and talking hats, not have to spend it on census statistics.
Nitpick:
Why would you think that would happen? Women already regularly outlive their fertile periods in real life. Unless you're also proposing some magical mechanism of fertility increase (and if so, why?), you wouldn't expect fertile periods to increase.
Of course, wizards would have longer fertile periods, but you still bump into the hard limit of how many children witches are willing and able to have.