In regards to selling data for anyone, the laws surrounding those topics change and vary between country, the type of data, how you are collecting permission and definitely age as well.
This is a highly sensitive and nuanced topic that doesn't have a clear cut answer. I would recommend reviewing our legal policies (Shopify Legal) and consider hiring a lawyer to assist you in understanding how these policies apply to you and the data you are interested in selling.
I'd love to learn more about your business. What kind of store are you planning on creating and what kind of data were you considering to sell?
Shay | Social Care @ Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog