Do my points expire?
The points credited to your account are valid for life. Provided you have collected at least 1 point in the preceding 12 months, your points will remain in your account, ready to be spent on rewards.
However, if your account is inactive, and you do not earn any points for 12 months, your points will expire. Your points will also expire if you decide to close your Maximiles account. Furthermore, if you have not responded to any survey invitations or updated your profile for more than 36 months, your account will be deactivated and data deleted.
Basically, so long as you keep active in the community, responding to surveys and updating your profile, your points will never expire, and your account will remain open !