Teenagers will be able to vote in the 2020 General Election if Labour wins the keys to Downing Street in May, the party has pledged.
The move was included in a raft of reforms that could also see rowdy MPs sent to a 'sin bin' for barracking opponents in the House of Commons.
The House of Lords would also be replaced with an elected Senate of the Nations and Regions under the proposals.
Legislative changes are currently underway to allow 16 and 17-year-olds to vote in the 2016 Holyrood elections.
But as things stand teenagers of the same age would still be barred from voting at the next General Election.
Labour's plans would see the introduction of votes at 16, regulation of MPs' second jobs, including a ban on paid directorships and consultancies, and a trial of online voting in elections.
Labour said that recent research had found that the public was dissatisfied with MPs' behaviour at Prime Minister's Questions.
Voters described the weekly confrontation between the PM and leader of the opposition as "childish", "over the top" and "pointless".
Labour's shadow leader of the Commons, Angela Eagle, said: "The recent debate over MPs' second jobs reminds us that so much needs to change in Westminster.
"When trust in politics and politicians is already at a record low, only radical reform will restore faith in our political process.
"We will reform the Commons to strengthen its ability to hold the government to account.
"And we will ensure our political system always puts people before rich and powerful vested interests."
She added that the MPs sometimes took the UK's adversarial political system "too far", pledging to consult on new powers for the Speaker to curb the worst forms of 'repeated' barracking.
The Speaker currently can only discipline MPs for grossly disorderly conduct.
Just two MPs have been ejected from the chamber for this reason since the 2010 election.
In Australia the Speaker of the House of Representatives can eject any member for "disorderly" conduct for one hour on their first offence.
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