Students must normally be seventeen years of age by 15 January following entry: i.e. for entry in 2025, date of birth must be on or before 15 January 2009. There is no upper limit.
If you will not be old enough and wish to appeal this, you can appeal to the Registrar. Your appeal should be accompanied by a letter of support from your School Principal to support your readiness to start third level. It should also be accompanied by a letter form your parent/guardian supporting your application, advising of your intended living arrangements and, if you are from outside Ireland, who will be your in-country guardian. You can submit this via www.ucd.ie/askus