A prenup agreement must be made in a certain way to be valid. Being valid means it can be relied on as a legal agreement and enforced if necessary. The agreement must:
• Be in writing
• Be made according to the prenup provisions in the Australian Family Law Act
• Be made between adults. That is, both parties must be at least 18 years of age
• Be understood by both parties
You must get independent legal advice from a lawyer who has no connection to your partner.