It depends on the person.Old people with a great observation skill do posess greater wisdom as this their characteristic. However, a person as young as 15 may also have wisdom inspite of low life experiences
English is not just useful to create an impression or something.It is essential if your company sends you to any english speaking country. Its more of a life skill. If majority of the world spoke mandarin, we probably would be learning mandarin instead of english. Its not right to link prestige...