If you review your overall situation, you say that you have been working for 18 years. ( Possibly other work you havent mentioned).
If this is true, you will only have worked for 28 years when you are 55.
I wish you a long and healthy life so lets assume you reach the average life expectancy of 84.
You need to have a pension fund which will last 29 years which is a big ask on 28 years work.
You will also need to ensure you have enough PRSI contributions to get the full state pension which you wo'nt at 55.