The reasons why the 'older' voters are looking for an exit from the EU are perfectly simple.
By virtue of their age, they remember the Common Market that Britain joined, and its basis in trade and beneficial exchanges of goods and services. They have seen that eroded into a European State that has its unelected officials passing laws affecting British citizens, its immigration systems unable to stop a tide of illegal migration, and the gradual erosion of the beneficial trade agreements that Britain signed up to originally.
If you have always lived with the EU in its present state, it's easy to accept it as simply being the way things are. The older voters remember how things were, and that what they want back - their sovereignty, their legal system, and their borders.
If Me Cable wants to pretend that it is anything to do with his perverse and racist notions of Empire-based 'nostalgia', then he is a bigger fool than he appears - difficult, but, it seems, possible.