Was your odometer rolled back?

Nope, I'm 54 and admit it. ; )

Seriously though:

1st the engine computer on modern cars will tell you the mileage if it is scanned by a dealer. So if the dash is swapped for a low mileage one you can tell.

2nd Each time a car is sold the mileage is documented by law so there are records.

3rd. It is almost impossible to change mileage anymore so it is unlikely