My grandparents never altered their WÜSTHOF 4596-7/20 Classic Ikon 8-Inch Cook's Knife since buying it on Aug 1 2018. It could effortlessly slash coconut and raw Winter Squashes, but now it can't even cut paper or pears or zucchinis! Undeniably they must alter their knife.
Before they buy a honing rod and/or electronic sharpener, how can they infer if it must be honed and/or sharpened?