Harvest Internships in Australia or New Zealand

Hello,
I am looking for an internship in either Australia or New Zealand. Currently, I am in the middle of an internship at a winery in Sonoma. Now, I am looking to do a harvest in another country. I am looking for some introductions so my resume does not get lost.

Visa issues: I am 37. I hear that it is tough to get visas for someone at my age. Any information or guidance would be great.

My ideal places to work:
Australia - Pewsey Vale
New Zealand - Rippon or Felton Road

Thank you in advance for your help

Vamsi