I don't think the UK is in terminal decline, but I do the UK and many other countries are going to have to make hard choices and shifts in perspectives and expectations to get through the population bulge as demographics switch.
I don't expect to retire until I simply cannot work, and in late 30s, made a career shift to work that I should be able to continue, health willing, for good long while and where it has been the norm for some time and will hopefully continue for people to shift from full time to flexi/part time as they get closer to 60, hopefully extended our ability to work. I don't expect my children to care for me if/when I get to that state, I've already started getting that support in place, though we have had conversations around it & how they see it. They have quite a few conversations about how they can help each other as they get older.
The government really needs to implement a scheme to motivate and support people into work.
The government has and funds schemes for this. I've been part of one designed to support disabled people into new work and supports while in work until 'stability' is reached, usually a few months, but can be over a year. They can be useful, but there are limits that often aren't thought of often, particularly it seems by government departments with these tasks.
I've seen staff members spend nearly 20 minutes trying to help a young woman log into their account on the computer to do job searches, she really struggled with it. Many entry and what are viewed as 'basic' jobs now have grown in complexity that means a growing portion of the population won't be able to access them. As a society, we have to figure out how to handle that and whether schemes into work is really the best place for them. It's a difficult problem that's always been with us, but I think is growing with demographic shifts and jobs getting more complex.
How many of them were full of self pity and “woe is me - I can’t do this and I can’t do that because of mental health?” They just got on with it.
That some of them had jobs didn't mean they were 'just' getting on with it. Many of the ones I've known, including those who had been conscripted, didn't. They self medicated themselves with what they could get their hands on and made their pain everyone else's problem. There is a reason there was so much talk and songs on 'mother's little helpers' to get through parenting, and plenty were using much more to get through work and general life, many expressing self-pity, woe, and someone else should do it attitude, some of them with a fleeting attitude towards employment.
Also, we have pensioners now who won't remember or ever had rations, which ended 70 years ago. WW2 has to stop being the touchstone for everything.