Extending a 482 visa

[Dee74]

Hello - I’m new to the forum and at the beginning of my migration to South Australia journey. Unfortunately I’ve left my plans a little too late,  as I’m now in my late 40’s and can only apply for a TSS 482 visa as I don’t meet the age requirements for PR. My occupation is on the medium term skills shortage list and I’m hoping to be granted a 4 year temporary visa. Does anyone know whether it’s possible to apply for another 4 year temporary visa when the initial visa expires? Or, has anyone successfully been granted PR after the 482 expiration even if they’re over 45? 

I’d be grateful for any advice - thank you!