An international dementia care conference in Dublin has heard that 150,000 people may have the condition here within 30 years.
Professor Suzanne Cahill, of the School of Social Work & Social Policy at Trinity College Dublin, said at that point 40,000 people with dementia may need long-term care - twice the total number in long-term care now.
Prof Cahill said there was a need to plan services and not just nursing home care.
She said the international model now was to delay residential care.
Minister of State for Disability, Equality, Mental Health and Older People Kathleen Lynch told the conference that the Government will publish a national dementia strategy next year.
She said that a consultation process would commence later this year.
The fourth International Dementia Care Conference in Dublin has been organised by the not-for-profit training organisation, Sonas aPc.