The findings come amid warnings about the dangers of relying on chatbots and social media for medical information.
Almost half of Gen Z said they had discovered that health advice they trusted online was inaccurate or misleading.
The figure was 45 per cent among Gen Z, compared with only 13 per cent among baby boomers.
Alastair Campbell, the former Downing Street communications director and mental health campaigner, said that much of the health information available online could not be trusted.
He said: “So many of the problems facing the United Kingdom relate to health, and so much of what we read about our health online is just wrong.
“It is tempting, given how much we go online in so many parts of our lives, to think this is where we find all the answers. But you have to be sure you can trust the source of the information – and all too often, you cannot.”
The findings come from the Bupa Wellbeing Index, based on a nationally representative survey of 8,002 UK adults.
Across all generations, 42 per cent of adults said they had used an AI tool or chatbot for health advice during the previous 12 months.
This compared with 53 per cent who had consulted a GP or doctor and 43 per cent who had used the NHS website.