You may need to update both your contact details, related to your Membership ID (your eligibility record) and your contact details, related to your .aero domain name. The first contacts you can update here. For the second one you will need to contact your registrar directly.
No, you can renew your domain name at any time and no registration years are lost with this process. Any additional registration years are added to the existing registration for up to 10 years.