The reason Ireland gave for not joining the other EU states in forming the Schengen zone in 1985 was the existence of the CTA with the UK, which would have disappeared if Ireland joined Schengen and the UK did not.
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The 90/180-day rule does not apply to Ireland and the following countries that have yet to join the Schengen area: Bulgaria.
Individuals from visa-required countries who would like to retire to Ireland will first need to apply for an Irish D Reside visa to enter Ireland. Once in the country, foreign nationals who are planning on retiring to Ireland can then submit their Retirement visa application from within the State.