I find Minerva a bit confusing now that her age is apparently different than I believed before. Granted, Harry's 11 and frankly, hardly knows anyone besides the Dursleys, a few neighbors, and whomever was at the primary school.

I do like the idea of there being inbreeding or something effecting purebloods and making it so they don't actually get as old as they might.

We really only have the tip of the iceberg with wizard longevity--it exists. There's so much more to discover (or write about).