As the flag of a British workers union flapped behind him on a blustery June morning, Liam Kehoe was on strike with colleagues outside Royal Liverpool University Hospital, demanding better pay for porters, cleaners and catering staff. Their wages have failed to keep up with the surge in the cost of living, and many said they were living paycheck to paycheck.

Mr. Kehoe, 26, serves food in the hospital. On Thursday, the day of Britain’s general election, he plans to vote for the center-left Labour Party because of the economic situation and the crumbling state of the National Health Service, he said.

Thinking of the life that his parents built on salaries earned as a nurse and a truck driver, Mr. Kehoe says that young people have been left with far worse prospects after 14 years of a Conservative-led government. “If you go back 30 years ago, houses were a bit more affordable, life was a little bit easier,” he said. “Nowadays, it’s like you can’t afford anything.”

Polls suggest more than half of voters under 35 plan to vote for Labour on Thursday, compared with 27 percent of voters over 65. While the gap between young and old in politics is not new, the extent of the split in Britain in recent years is exceptional, with support for the governing Conservative Party dropping sharply in all but the oldest age group, according to recent polls.

Before 2019, the major factor in whether people voted Conservative or Labour was income. More recently, “age has replaced class as the defining way in which people vote,” said Molly Broome, an economist with the Resolution Foundation, a British research institute.

The northern English city of Liverpool has long been a Labour stronghold with a proud working-class tradition. Many young people said their allegiance to the center-left party has been strengthened by a sense that their needs have been ignored by the Conservatives.

Mr. Kehoe and his girlfriend are trying to buy a home. “The housing market is on its knees,” he said. “The whole country is falling to bits because this government is in it for them and not in it for us. They don’t care about us, the little guys at the bottom.”

Others expressed broader discontent at a political system that they said did not account for their needs. Some young people said they would not vote at all, while others would cast ballots for third-party candidates who had little chance of winning more than a few seats but whose ethos was more aligned with theirs.

Much of the political messaging from Britain’s two main parties has focused on the priorities of older generations, experts said, since they make up a large proportion of the electorate, partly because of population shifts. They are also more likely to vote: Some 96 percent of people over 65 are registered to vote, compared with 60 percent of 18- to 19-year-olds and 67 percent of those 20 to 44, according to a 2023 electoral commission report.

Politicians have safeguarded some policies that support older people, even as younger generations face worsening standards of living. The pension “triple lock,” for instance, introduced by the Conservative-led government in 2011, ensures that the state retirement income — similar to Social Security in the United States — rises each year by the highest of earnings growth, inflation or 2.5 percent.

While age remains the major dividing factor in support for the two main political parties, there are also divisions within the younger generation, Ms. Broome said. Labour has had a positive swing in polls across all generations, except among millennials who did not graduate from university and those who do not own a home.

“It’s not the fact that they are more likely to vote Conservative; it’s the fact that they are less likely to vote at all,” Ms. Broome said.

“I just can’t say there is anyone I actually agree with, so I really wouldn’t be inclined to vote,” he said. He remembers being “baffled” in 2016 when the country voted to withdraw from the European Union.

“With the state the country is in now, and with the whole Brexit situation, it just feels like it’s gone completely wrong,” he said.

Brexit looms large for many. In Liverpool’s Baltic Triangle, a former warehouse district with a thriving creative scene, young men skateboarded in the evening light. The rhythmic roll of their skateboard wheels echoed off brightly painted walls.

One of the skateboarders, Joe McKenna, 26, was the first in his family to go to university. In the Brexit referendum, his first vote, he opted to remain, while both of his parents voted to leave.

“I think that was the first time I noticed a divide between what my parents think about and what I think about,” he said. “Now, we don’t really talk about it, because it’s happened and I think they know it’s not a good situation. But I don’t blame them.”

With the fallout of Brexit in mind, he plans to vote Labour in the upcoming election.

“I see them as the lesser of two evils,” he said. “A lot of working-class people voted Tory in the last election because they convinced them there would be change. And, obviously, with Brexit, that swayed a lot of opinions toward the Conservative Party.”

Housing is another focus of discontent. Some 70 percent of young British people say they believe the dream of homeownership is over for many in their generation, according to a study from the Center for Policy Studies, a British research group. And the data backs up that view: Thirty-nine percent of 25- to 34-year-olds owned their homes in 2022-23, down from a peak of 59 percent in 2000.

Even some young Conservatives, like Olivia Lever, 24, said they felt forgotten in this current campaign. Ms. Lever, a founder of the University of Liverpool Young Conservatives and director of Blue Beyond, a grass-roots group for young Tories, said there had been no effort to appeal to younger people’s needs.

“In the Conservatives, for some time, there has been a gap between the younger members of the party and the older members of the party,” she said. “With this election — where is the growth? Where is the house building? Where are the jobs? How are we inspiring and empowering people?”

Ms. Lever said that many young people had become “completely disenfranchised with politics because it is very older-people-centered,” pointing to a recent survey her group did of young Tories that asked them to describe the current campaign. Many answered: “Boomer-ist.”

On the other side of the political spectrum, young people who identify with the progressive left also described feeling disenfranchised. At the University of Liverpool, a small protest encampment against the conflict in Gaza sprang up last month, inspired by similar demonstrations in the United States.

Students and recent graduates there expressed frustration that Labour had not immediately called for a cease-fire or condemned Israel’s actions. Aamor Crofts, 21, who is studying wildlife conservation and has been camped here since May, plans to cast her ballot for a Green or independent candidate.

“I don’t see any major party that truly represents me,” she said. Young people, she said, had been left to deal with the fallout from Brexit, economic troubles and skyrocketing house prices. “This isn’t the country we want to inherit,” she said.