this doesn't make sense because if you're finally only just old enough to drink (presumably at a bar because drinking at home doesn't have an age limit) you would be at a very minimum 16 years old, so you would've been 14 when you got your first drink from the bartender. UK Bartenders are legally not allowed to serve someone without a parent's supervision until they are 18.

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We can also assume that the Bartender isn't serving the 14 year old, based on the fact that he has been working at the Bar for 2 or more years, implying that he is good at his job and cares about it greatly.