Conversation so far:
when was voting age reduced to 18 in uk
The Representation of the People Act 1969 lowered the voting age from 21 to 18, with effect from 1970.
does the Representation of the People Act 1969 have another name
The Representation of the People Act 1969 is sometimes known as the Sixth Reform Act.
what did Representation of the People Act 1969 act do exactly
The Representation of the People Act 1969 extended suffrage to 18- to 20-year-olds in the United Kingdom.

Question: why was the act passed
Self-contained rewrite: why was the Representation of the People Act 1969 passed