"Every seven years your body changes."
As an adult, this has proved to be true. Even science backs up Grandmama on this one, nearly every cell in our body including the ones which make up our bones are in fact replaced over time (although its a lot more complex than that...).
Think back to seven years old. Parents- think of your child at 7 years old!! The age of reason, and I will add the age of individual opinion, lol. Fast forward to fourteen years! Ok, enough said on that age....now 21..... These are defining years for most people, when not just our physical body changes, but our persona and status too.
Interestingly, seven years comes up as the final number of many cycles. Debts are cancelled after 7 years. Bad luck from broken mirrors thankfully disappear. The famous "seven year itch," in marriages. I have noticed in my personal life, many events, people and places have come back to me full circle from 7 years ago.
So it seems, every seven years is a time for renewal, and cancelling debts. Of letting go of old cycles, habits, people and even places. Like the week, which restarts every seven days, every seven years is the time to purge what you've been hanging on to and start a new journey.