Can this be used as a booster seat once child is older

Hi Angela, thank you for your enquiry, the Maxi Guard Pro is suitable as a booster but only until the age of 8 years or until the child shoulders reacher the markers on the side of the car seat. We hope this helps.  For further information on this or any of our other products available, 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.