Shipping Internationally- Senior horse

Does anyone have any advice on shipping a senior (24yo) horse internationally?

Travel would be USA to Australia. Horse is in excellent health, still being ridden and shown lightly.

No lameness or health issues.

I have owned him for 20 years and i now live in Australia and he is no longer able to board at the farm that he has been stabled at the past few years, plus it’s expensive to transfer board across every month.

Should I ship him across the pond? :confused: