So a few weeks back i sent my razors in to get re-honed and ready for the new year and to my surprise the honer wrote back that a few of the blades were to soft to take a razor's edge. And that got me thinking do razors get softer with age ? do the decades of stropping, honing, water interaction weaken the metal the razor is made out of. And is it feasible to re-harden these worn out blades or just keep then as decorative reminders of the past.
Has any one had this issue or hows why this happened.

PS- I trust my honer when he says they can't be sharpened as is, and i can't wait to get all my razors back and shaving.