A referendum should occur for 16 and 17 years olds having the right to vote

We have seen in the Scottish referendum that 16 and 17 year olds have voted on a rational basis and not as protest votes. I truly believe that if we are living in a so called "liberal democracy" or "representative democracy" then the voting in the general election must represent the whole population and therefore represent those of a younger age for the fairest outcome and the fairest election. The Scottish referendum had a ground breaking turn out of almost 85%. If we allow younger ages to become part of the electorate , then more of a fair change may come about.