Usually, but not always. Typically, as time goes on, standards and protocols used to measure one metric ton of offset carbon in a project type can improve and become more accurate than previous methods. However, that's not necessarily always the case. Some older vintages may have followed more rigorous standards than were required at the time, or perhaps the protocol has not changed, and now the carbon credit reflect the same environmental benefits as more recent vintages. Offsets with older vintages are often cheaper. So if budget is a constraint, purchasing older vintages can allow you to start progressing on your sustainability goals for now. It's important to consider all of the elements of the transaction as a whole to determine if a particular vintage and carbon credit is right for your organization.