There will only ever be less jobs. It takes less people to make cars than it used to, it takes less farmers to create the same amount of food as it used to... rinse repeat everywhere.
We've been creating "fake" jobs to replace real ones for decades. The current system can't work forever, its a joke, when and how it fails is anyones guess and likely won't be for a long time yet. One good worldwide plague and we can start a fresh anyway.
THeres only so long a system can continue creating paperwork jobs out of thin air to occupy the masses, a huge number of which are paid by taxes, as tax income(compared to the population, adjusted for inflation) goes down every year.
There are less jobs, there will always be less jobs. 1000 people would work in a factory producing items slowly, now 10 people and 100 robots created the same items at a hugely increased rate. There are thousands less jobs and things being made faster than ever.
Retirement age is a consequence of bigger population and less effective tax income, you need to work longer to pay for pensions, and pension schemes only pay out effectively based on nothing more than a pyramid scheme. The 20 million workers tax contributions now pay for the 5 million pensioners, in 30 years it NEEDS to be 35million workers tax contributions paying for the at that time, 15million pensioners, etc, etc. Problem is, population won't grow that fast, shrinking economy(effectively), decreasing jobs required/available, decreasing tax generating jobs mean the ponzi scheme can't continue.
For the moment we need higher retirement age because it puts more people in the work bracket than pensioner, AND people will be on pensions for a shorter amount of time dramatically scaling back the amount paid out in pensions(or keeping it in check more realistically now 5million pensioners living on average say 20 years after retirement, or in 30 years, 15 million pensioners living on average 10 years after retirement.
One way to offset loss of jobs is what Labour had been trying to do for the past decade, get every single last person they can into Uni, gap year, 4 years in uni, as many as possible into masters/phd's, to offset as many people as possible. So instead of working 18 to 60, more people work from 22 to 65. It keeps a large number of people out of the job market if they are in education, Labour failed to understand massive growth in numbers of students at uni meant massive extra education spending, making any savings a wash.