My hon. Friend has made his point about shrinking childhood before. I say to him that maturity is not an exact science. There will be some people who are mature at 16 or perhaps less, and some who manage to hang on to their immaturity for a great many years after that. I do not believe that any of us can pinpoint an exact age.
One thing that the EU referendum has in common with the major constitutional referendum that took place in Scotland last year is that it is a decision for a long time into the future. To quote the right hon. Member for Gordon (Alex Salmond), who is not here today, it is a decision to be made once in a lifetime, or at least for a generation, not something to be repeated every few years. I hope that all hon. Members will agree with that. The referendum will not return every few years like general elections.