Coincidence or pattern?

My mother was born in 1952. I was born in 1973.

When my mother turns 73, I will be 52.

My father was born in 1949. When my father turned 73, I was 49.

Is this pattern unique or coincidence? I can’t understand if I’m choosing to see a pattern, or if there is one. How is it possible that our ages can reflect birth years like this for both parents. Haley’s Comet type event?

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