Translation:Are you really buying a sixteen-year-old car?
- jeden rok staré auto
- dva roky staré auto
- tři roky staré auto
- čtyři roky staré auto
Learner here, so if I made a mistake I suggest you reply directly to simeki, and I will then delete my answer.
Edit: The singular of léta (years) is léto but it means “summer;” I don't think one can use it with the meaning “year”. Rok is normally used for that.