What is the lifespan on this seat and what standard rating does it have?

Hi Lauren, Thank you for your enquiry. The Britax Boulevard Click Tight has en expiry date 10 years from the date of purchase and is compliant to the New Zealand standard ‘S’ Mark. For further information on this seat, if you click on the pink “Specifications” tab below the product image, this will give you a breakdown of dimensions and info for this seat. If you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have. We hope this has helped with your query.