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I'm finding it rather slow turning up literature on the preferences of patients and the general public for naming these services. Different services can refer to themselves as Geriatic Psychiatry, Psychiatry of Old Age, of Older Age, Mental Health in Late Life and so on.
I've a few papers on the subject, but I wondered if anyone out there was actually researching or writing up the topic right now. It would be good to hear what you're finding.
I note that the only one of these terms that's am official RG tag is Geriatric Psychiatry. Ugh.