They also have a major population bomb that's getting much closer to exploding and taking their entire system down with them. They already are taxed at close to 90% of their income and a Swede in the top 5% has $5,000 US in the bank and owns their home. The population is growing at less than replacement something like 1.25 to 1.5 per couple and continuing to drop. They have a fairly large population bubble of baby boomers that's just approaching the age that they will be leaving the work force. Since the populations behind them to support them in their old age is much smaller it would require a larger chunch of tax $$ to support them. When you are being taxed at 95% already it doesn't leave room for a tax increase. The only alternative is to cut services or perhaps get the old people to die off more quickly so they aren't a burden on society. If they take in a lot of immigrants to support their older people they loose their culture as the real Swedes become a smaller and smaller minority in their own country over time. No matter which way they go it's a no win situation. Curiously, the life expectancy in Sweeden is higher than in the United States (despite Sweeden's socialism).
And if People in Sweeden are living longer, they must be pretty healthy.
And if they're so healthy, let them work longer. No problem.
Working longer? That would violate the contract they have with government and society to be able to retire at a certain age. If the government fails on it's promises the social contract fails and it's major disruption time.