Board Thread:Questions and Answers/@comment-675805-20130321141052/@comment-7750832-20130403053856

It's confirmed in the film that there are other, older Kyoryugers. Gold (confirmed new ranger) is coming from about 300 years prior series start.

As for what the Contributor said, this is quite possible as Ramirez mentioned something along the lines of wishing for a team such as what they had. This, coupled with the fact that we know Gold existed/exists, it is a very safe assumption that there are other rangers, or at least 'spirits' of other rangers.