Ohhh yes this happens to me at least once a week. People are always thinking I'm 15, surprised that I drive, and referring to me as my (younger) brother's younger sister.
The line that gets me the most is when people younger than me say "what grade are you in, honey?"
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For I do not want you to be unaware of the affliction I experienced. For I was so utterly burdened beyond my strength that I despaired of life itself. Indeed, I felt that I had received the sentence of death.
But that was to make me rely not on myself but on God who raises the dead. He delivered me from such a deadly peril, and he will deliver me. On him I have set my hope that he will deliver me again.
2 Corinthians 1:7-10, Holy Bible