I very much doubt there'll be a published age limit, in line with Aer Lingus (?), but the reality may be different
The above comment does not reference the law. It merely correctly states that while there may not be a published age limit, there may in reality be a target age group. Civil aviation legislation stipulates that, for safety reasons, pilots may not operate public transport aircraft beyond a certain age (I believe this to be 65 years). It stands to reason that an airline is unlikely to seek candidates near this age.
The Employment Equality Acts 1998-2008, prohibit discrimination in employment on a number of grounds, including age. It is unlawful to discriminate against anyone in employment on grounds of age. The Acts only apply to persons above the maximum age at which a person is statutorily obliged to attend school (16 currently). However there are a number of exceptions to the general principle of non-discrimination. The Acts also provide for positive action on a number of grounds including age. The Acts are enforced by the Equality Authority and the Equality Tribunal.
Exclusions from the general prohibition of discrimination on age grounds
An employer may:
set a minimum age requirement (not more than 18 years) for potential applicants for a job.
offer a fixed-term contract to a person over the compulsory retirement age.
There are also exemptions inserted into Section 34 by Section 23 of the Equality Act 2004. With regard to an an occupational benefits scheme, it does not constitute discrimination on age grounds for an employer:
to fix ages for admission to such a scheme or for entitlement to benefits under it;
to fix different ages for all employees or a category of employees;
to use, in the context of such a scheme, age criteria in actuarial calculations, or
to provide different rates of severance payment for different employees or groups or categories of employees, these rates being based on or taking into account the period between the age of an employee on leaving the employment and his or her compulsory retirement age,
provided that these measures do not constitute discrimination on the gender grounds.
I trust this resolves your query, Chromeo.