With 700,000 points, you should have a closer read of the terms and conditions:
http://www.aeroplan.com/terms_and_conditions.do
Specifically:
19. Mileage in an account expires 7 years (84 months) after the date of accumulation. Mileage accumulated in an account prior to January 1, 2007 is deemed to have an accumulation date of December 31, 2006 (regardless of the actual mileage accumulation date). Mileage may expire without further notice.
I am not sure what "reminders" they have for you for how much falls off the table when, but it is presumably a problem closer to 2013.