This idea is particularly useful for including friends and family far away, who might not be able to attend the party, or for those that they're only in occasional contact with, such as old school friends. The postcards come with a 'directions card' that asks them to write a favorite memory, kind note, or birthday wish for the birthday boy / girl and mail them back in the week leading up to their 70th birthday party. Make a list of 70 of the birthday boy or girl's friends, family, and co-workers and mail them any one of these blank, pre-addressed, postcards (which can be personalized for any age / milestone birthday). It takes a bit of planning, but it's worth it. This is a really thoughtful idea and I love it because it fits prefectly with the idea of celebrating the person and making their 70th birthday really personal.