Old man wants to update site/blog. What can I set up that would be (very) easy for him to use (add posts). Currently on WordPress and it's a nightmare!

Just use wordpress for old people is good but not for developers.

Haha. This is most stupid and sense able comment.

i set up an automated email system beside my normal input form.
i suggest creating an special inbox, check for new emails on pageload and process them to the database. subject for title, content for content, regex filter for #tags and attachments for images. and he can edit it offline in advance as long as he wants. for me it works like charm, although i admit it is customized to my very own infrastructure.