This paper investigates how matching age of driver with age of voice in a conversational in-vehicle information system affects attitudes and performance. 36 participants from age groups, 5575 and 1825, interacted with a conversational system with young or old voice in a driving simulator. Results show that all drivers rather communicated with a young than old voice in the car. This willingness to communicate had a detrimental effect on driving performance. It is hence important to carefully select voices, since voice properties can have enormous effects on driving safety. Clearly, one voice doesnt fit all.