Someone who wants to write should make an effort to write a little something every day. Writing in this sense is the same as athletes who practice a sport every day to keep their skills honed.
Day-old bread? Sadly, in America a lot of day-old bread just becomes nasty. Italian day-old bread, not having any preservatives in it, just becomes harder and it doesn't taste old. What I would warn people about is getting bread that's loaded with other things in it, because it starts to taste old.