Qwark,
The agency ad said the visa is limited to age 45. It didn't say anything about residency. Here is a quote from a lawyer page.
TSS 482 Visa To PR | Age Requirements
There is no age limit for the 482 Visa. This is an important fact of the 482 Visa and is also one of the major advantages of this visa.
There are age limits for most of the other Skilled visa, including the following:
- RSMS 187 – Age limit 45 years old (with very limited exceptions)
- ENS 186 – Age limit 45 years old (with very limited exceptions)
- GSM 489, 189 and 190 -– Age limit 45 years old