Pension questions would have to be directed to your employer. The US doesn't have a public pension. We have social security which you have to be a certain age to get. That question is best addressed to the social security office. There's one on Isom Rd. Just working for 20 years alone otherwise doesn't mean anything which is why financial planners encourage folks to save for retirement.
You may have social security benefits - talk to them about that. You may also have retirement accounts through your employer. You can usually roll those into a Fidelity or other brokerage account. Get lots of advice here and in Ireland so there are no tax surprises.
This answer DOES NOT establish an attorney-client relationship. This answer is based on the limited information provided and is not intended to be conclusive advice. There are likely other factors that might influence or change the advice after a more lengthy consultation.