The main difference is in the age of the contracting parties to a marriage. It cannot be used interchangeably.  You need parental consent if you are below 21 but not younger than 18. If you are between the ages of 21 and 25, you need to get parental advice. Both are required in applying for a marriage license. Another difference is that failure to get parental consent renders the marriage voidable, while failure to get parental advice does not affect the validity of your marriage. Hence, if you fail to get parental consent before marriage, your parents or guardian can file a petition for annulment under Art. 45 (1) of the Family Code. But if, after reaching age 21, you have freely cohabited with the other party and lived together as husband and wife, the defect is cured, and your parents can no longer file for a marriage annulment.