I have reference materials from the late 80's (when I finally took lessons and learned to fly).  The son of a friend is possibly interested in flying.  Some of this material would still be useful for a new student, yes?

Obviously the airspace designations have changed as well as the weather briefings/information and some avonics, but airplanes still fly the same and basic weather information is still the same, yes?

FAA.gov has free downloads of current training manuals.

Airplane a Flying Handbook
https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/airplane_handbook/media/airplane_flying_handbook.pdf

Pilots Handbook of Aeronautical Knowledge
https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak/media/pilot_handbook.pdf

Risk Management Handbook
https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/media/risk_management_hb_change_1.pdf

Weight and Balance Handbook
https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/media/FAA-H-8083-1.pdf