Who Got To Vote in the EU Referendum ?

Here is who got to vote : http://www.independent.co.uk/news/uk/politics/eu-referendum-how-do-i-vote-where-is-my-polling-station-date-register-glastonbury-postal-brexit-a7043436.html

16 and 17 year olds did not get to vote and here is why, even though if you look at this chart below you will see that those age groups will be aged 19 and 20 at the time that the UK is due to finally Brexit - surely this alone is reason enough why they should have been given a say in their future.
http://www.independent.co.uk/news/uk/politics/house-of-commons-votes-against-lowering-voting-age-for-eu-referendum-a6764966.html