Originally Posted by
drminn
This may be old news to some on the board, but I just noticed an interesting artifact in my credit karma profile. Between September and November my AOA went up by 25 months, or a little over two years. The only explanation I can come up with is that I opened 2 AMEX cards in that time frame, the SPG 30K promotion and the Delta 70K promo. I have had AMEX cards for more than 25 years, so they must have somehow reported the original opening date as the age of those new accounts.
It's a well-known thing that Amex reports new personal accounts as having been opened in the year that is indicated on your cards as the "Member Since" date (which is the year your first Amex was opened, if you've continuously held at least 1 personal Amex at all times), with the month the new account is opened being the actual month.
For example, my first personal Amex was opened in Dec 1999 and that is the open date on my credit report. My SPG Amex was opened in Aug 2012, but shows a date of Aug 1999.
In fact, from past experience, this is even true when doing a Global Transfer (at least from the US to Canada).