One last age question

Terribly sorry about this, but I can't find clarification in any of the posts so far:

In what year were our initial Family Members born in? 0 A.T. or 10 A.T.? No Member in the GNDT has 0 listed as his/her birthdate, so it seems as though we began at 10.

Also, Rule 12 (Death and Inheritance) states:

If any Family Member would become older than 70 Years they die of natural causes.

And Rule 16 (Calendar) states:

The Year is tracked in the Blog sidebar. It is measured in Years A.T. ("Anno Truman"). Once per day at midnight GMT the Calendar advances 10 Years.

Periodically the Calendar will advance 1 year. This has no game effect other than to indicate the time until the year increments; the Year is still considered to be what it was at midnight.

From these I draw two conclusions:

1) The "68" dates for Sylvia and Edmund Simon-Simon should actually be 60.
2) A Member dies in the year he would otherwise turn 80, so the first generation will die in 90 A.T.

This isn't a Proposal or a CFJ, since I haven't checked in a couple of days (a n00b mistake I won't make again, I assure you) and a lot has happened. Sorry for rehashing old questions.