"Older flagships" refers to smartphones that were once considered top-of-the-line models or the best in their respective series. These are earlier released flagship phones that have been succeeded by newer models in the market. Full definition
Thus, until it dies I will continue using my present two year old flagship. (tomsguide.com)
I'm shocked that your three month old flagship phone is not blown away by the rumored phone to be released three months from now. (sammobile.com)
Another thing that is unclear regarding the update to the latest Android software is that the status of other older flagship devices is also not known. (nashvillechatterclass.com)