The Languages of Tolkien

While doing some research on Tolkien's languages, I found out some interesting things.  Apparently, Tolkien began inventing his own languages at a very young age, and at the age of twelve began the Elvish language found in The Hobbit.  There are two branches of Elvish (Eldarin), the Quenya dialect and the Sindarin dialect.  Estimates of the words Tolkien made up range from 10,000 to 60,000.  There are also 13 other langauges spoken in his books, Westron being the most common.  It is what is "translated" into English (or German or French).  All common people except for elves can speak Westron.  Another interesting fact about the Elves is they did not just write down their langauges, they used Runes.  Runes are an ancient form of writing.   It is beyond my understanding as to how one person can have such a fascinating mind to make up 15 languages and their dialects.  Tolkien was an amazing writer, but obviously had other talents as well!