It’s inevitable, aging that is, and what better way to document its physical effects than by taking pictures? That’s exactly what these four sisters – Heather, Mimi, Bebe, and Laurie – did for 36-years, up until 2010. Continue reading to see more.

American photographer Nicholas Nixon once took a photo of his wife Bebe and her three sisters. Mimi, the youngest of the sisters, was 15 in the first photograph, and Bebe, the oldest, was 61 in the last one. When the series started in 1975, the Brown sisters were aged 15-25.

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