Yubikey support for age

[grarpamp]

Problem with all these "amazing" hw privkey stores
is when they fail, which all of them will, especially by
emp or solar flare or silicon or flash rot, users lose
access to their keys. Of course the vendors never
disclose this fact in their advertising spam, none
of the shillers even grasp it. All the users coin,
email, etc... gone forever. Nothing beats paper or
otherwise redundantly and indestructably backed
up and hidden.