Without getting overly philosophical I would like to point out that curiosity and creativity plays a vital role in the ability to pick up a language. As we age these core assets of value tend to diminish in favor of so-called "mature" approaches to life.
When it comes to school it is may end up becoming a forced relation between the pupil and the language in question - a bad combination.
When it comes to self-study I guess this is where I usually excel out of curiosity and some other kinks I employ to make learning more dynamic and enjoyable.
As for digital learning I suppose I am not knowledgeable enough, yet. When it comes to Lingvist I am slightly disappointed that I there is no double layer of words implemented to circumvent and diminish a humans ability to choose patterns over word memory. What I mean under the "double layer" is that words should have at least two sample cases split over a longer time horizon in the studying process to provide a more dynamic studying experience.
When coming back to different ages this topic goes way beyond language learning and each brain has areas that need improvement - something that is constantly neglected by the majority based on empirical experience when interacting with people. There is something unnerving about these tendencies - let us see where this leads us as a society
Etc. etc. in an effort to keep is short and simple.
P.S. Please, do something about my username being my e-mail.