Is it true that a marriage certificate for a 'Stay based on Marriage' visa in Thailand must not be older than 6 months?

The user is preparing to apply for a 'Stay based on Marriage' visa in Thailand and seeks clarification on whether their marriage certificate must be less than 6 months old. Comments indicate that while some immigration offices may require a Kor Ror 2 form as confirmation of marriage, at least one user successfully obtained their visa with a certificate older than 6 months.