Come up with a question and reasoning that would justify this answer: 1970
The question is: The UNCRC defines children, for the purposes of the Convention, as persons under the age 18, unless domestic legislation provides otherwise. In that spirit, this timeline includes as children all those below the UK age of majority, which was 21 until 1970 when it was reduced to 18. Although the Crown Dependencies of the Isle of Man, Guernsey and Jersey are not constitutionally part of the UK, the British government is responsible for their external affairs and therefore for their international treaty obligations, so this timeline includes references to matters in those dependencies.

Answer this question based on the passage: when did the age of majority change from 21 to 18 in the uk?
Step-by-step reasoning process: This is the relevant information: In that spirit, this timeline includes as children all those below the UK age of majority, which was 21 until 1970 when it was reduced to 18.
