Since you described yourself in at the beginning of your post as "Senior Technologist" I don't see why you would leap to the assumption when the manager used the terms, Senior and Junior you would assume that it had anything to do with your age.
Since you described yourself in at the beginning of your post as "Senior Technologist" I don't see why you would leap to the assumption when the manager used the terms, Senior and Junior you would assume that it had anything to do with your age.