So ruling out a suspect on eye color may not be sound. One online report has a brown to blue shift occurring at age 69.
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I had the surgeries at age 67 and never gave any thought to eye color changes. But several years ago, a dermatologist - repeat dermatologist - asked me what my eye color was. I said they were brown and he disagreed. But even he couldn't settle on a single color and mentioned several colors as possibilities.
I have asked eye specialists, and others, about my eye color and have received a wide range of answers. Most of them mentioned hazel as a possibility but included other colors as well. Maybe the color will be blue in a few more years.