75! Take a bow, please. Not many are lucky to celebrate their 75th wedding anniversary, so you should be terribly proud of yourselves for being with each other for all those years. The official theme for this year is diamond. I'd urge upon the jewelry again. A ring, a pendant, earrings or simple diamond studs. Awesome, awesome.
You wouldn't forget the day you were getting married, so make it a point to celebrate the anniversary of that very special event each year. How you celebrate the anniversary depends on many factors. Can you find a babysitter? Can you book that favourite restaurant? If it's a surprise, will it be a welcome one?