As per the PA EOL policy, they would support following,
https://www.paloaltonetworks.com/services/support/end-of-life-announcements/end-of-life-policy
PAN-OS Version Support Policy
Major feature releases will be supported for 24 months from the date of release.
Minor feature releases (see definition below) will be supported for 42 months from the date of release.
Support may include technical support, bug fixes, Maintenance releases, workarounds, and patches for critical bugs.
VM-Series Accelerated Feature Releases (XFR) will be supported for 12 months from the date of release.
... View more