No, it is not. There is a correlation in that the younger you are, and the more education you have, the less likely you were to vote for Brexit, but that doesn't mean that Brexit was only voted for by old uneducated people.
Of course it wasn't only. Some young phds voted to brexit, where some 70+ who left school at 15 voted to remain.
However time and again we see that ABC1, degree, young, guardian readers voted remain, and EDC2, GCSE, old, sun readers voted to leave, both in scientific polling and in anecdotes.
That's just needlessly dismissive.