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These photos are gorgeous portraits of two people very important to you. Think about the details of what these photos portray for those of us who do not know them.
I think this is a good portrait of aging. Your mother's eyes are the same bright eyes 50 years later. Her smile is the same, too. Her hair, although a different color, still highlights her face. Her hands, while older and showing more wrinkles, still caress your father's shoulders as they did 50 years ago. She has the same ring on, showing the continuity of their lives.
Your father has aged, but still shows the facial features of 50 years ago. His eyes are as bright as your mother's. His smile shows a bit of aging but retains the essence of his twenty-something smile. His shoulders look as broad as they were in the earlier photo.
Perhaps most important, they look as happy in the later photo as they do in the earlier one. They obviously have had a good 50 years together. Great photos!