Is reupholstering old furniture recycling or is it up-cycling? Old as in older than most of your grandparents.
I wouldn’t call it either one.
I’d call it ‘Reupholstering old furniture’.
I’d say neither. You’re restoring or refurbishing.
IMO, the definitions of recycle and upcycle involve creating something different from something that would have been trash. For example, surfaces for play areas have been created from old tires, toilet paper is created from scrap paper, etc.