> Why do you need to apply all of this conscious effort to "strengthen memory" if other people, or yourself previously, could easily remember the plot details o

> Why do you need to apply all of this conscious effort to "strengthen memory" if other people, or yourself previously, could easily remember the plot details of most movies you had watched, names of peoples you had met, etc. without ever having to think about it? Why do you have to exercise in your old age when previously, when you were young, you were comparatively fit without trying? Biology is full of "use it or lose it" because maintaining any ability or skill costs energy.