Speak Out!
I am 34 years old and my sister is 35 and neither of us have ever had a tattoo.
Speak Back!
Maybe and maybe not.
After 173 full body searches of East Texas women, I must report that you might be correct. However -- Have you ever had one of those nights when you drank just a little too much and can't remember how you got home?
My searches have uncovered 2 tattoos that the ladies were unware of at the time of the search.
This means that you have a 1.16% chance that you have an unknown tattoo. As a public service I will provide you an examination at no charge. I also extend the same offer to your sister.