The terms of the Labour Agreement, including any age based, English language based, or salary based concessions, are a matter of negotiation with the DIBP and are considered on a base by case basis.
You must have a strong business case for requesting concessions to age, English language or salary requirements applicable to the given visa your foreign workers will eventually be applying under.
English Language
Overseas workers are generally required to have achieved a score of 5.0 or more on the IELTS test, and a score of no less than 4.5 on each individual component of the test (or equivalent scores on another suitable English language test, such as the OET, TOEFL iBT, PTE or CAE tests).
There are some limited exemptions to this requirement, such as if the visa applicant holds a passport from a certain country or has studied for five cumulative years in an educational institution where all the instruction was delivered in English.
As stated above, you must have a strong business case for requesting a concession to the relevant English language requirement.
Salary
Overseas workers are generally expected to be paid the market rate, which must be no lower than the Temporary Skilled Migration Income Threshold (TSMIT), which is currently $53,900. A concession of up to 10% of the TSMIT is available in limited circumstances where an organisation has a strong business case for requesting such a concession.
Skills
Labour Agreements generally require that overseas workers have a qualification at least equivalent to an AQF Certificate III, as well as three years of relevant work experience. In addition, overseas workers are expected to be able to meet all industry registration requirements to ensure they have skills to Australian standards.
Variations to the requirements for qualifications and experience may be considered in limited circumstances only, where supported by a strong business case.