Retirement mistake #9 is getting married a second time without a prenuptial agreement.
If your first marriage ended in divorce, I suspect I'm preaching to the choir. You now know that you should have had a prenuptial agreement in place for that marriage.
A "prenup" is even more important the second time around. You're worth more. You probably have children who are less than thrilled about your new partner and the effect this relationship could have on their inheritance.