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This study investigated whether seeing a conversational partner while carrying out a collaborative task (diapix) in easy and difficult communicative conditions affected clear speech adaptations in older and young adults. 17 older (OA) and 13 young (YA) women were recorded while doing diapix with a conversational partner; in one condition, they could hear each other normally (NORM) while in another, the partner had a simulated hearing loss (HLS). Both conditions were in audio-alone and audiovisual modes. Articulation rate, fundamental frequency, mid-frequency energy and gaze count were analysed. In NORM, seeing their interlocutor had little effect on acoustic characteristics for OA or YA talkers. In HLS, across talker groups, gaze frequency increased and clear speech adaptations in articulation rate and mid-frequency energy, but not F0, reduced when talkers saw their partners. These findings support the view that interlocutor needs and the aim to minimise talker effort both affect clear speech adaptations.