I'm 30 and my siblings still refer me as their baby sister, is this common?

I'm the youngest of my 2 siblings. I'm 30, my sister is 34 and our brother is 37.

We're all grown ups, live in different towns but still visit each other on vacations or during Holidays. Till this day, they still call me their baby sister. Is this common?

I'm 30 and my siblings still refer me as their baby sister, is this common?
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