brent NIST no longer recommends that companies force password changes more frequently than once per year. Apparently, studies showed that more frequent forced password changes corresponded with users creating weak passwords and/or writing them down or otherwise storing them in plaintext. I think most companies of any size changed security practices accordingly, and that's probably a good thing.
That reasoning doesn't apply, though, to individuals using password managers, because there is no need to remember a password. A password manager can be used to store strong, randomly generated passwords, each unique to a specific site, with dual authentication on banking, investment, medical and other sensitive sites.
Since there is no reason to create passwords that can be remembered, it doesn't hurt to change the passwords periodically. It is probably overkill, but that's what I do, on the assumption that every site which stores my credentials will be hacked sooner or later.