Girls, at what age did you start to worry about getting breast cancer (or think you will start to worry about it)?

Girls, at what age did you start to worry about getting breast cancer (or think you will start to worry about it)?
When I turned 40, the thought of "oh @#$%, my breasts can kill me" hit me like a ton of bricks.
Girls, at what age did you start to worry about getting breast cancer (or think you will start to worry about it)?
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