Earlier quoted context omitted.
What even is retirement age and what practical impact would changing it have on society? People can retire or keep working at whatever age they want as long as they can afford to
Retirement age is usually tied to various benefits. In the UK it's the age at which you can collect the state pension (currently around £12K per year, if you worked for 30-35 years). Changing the retirement age therefore affects the state's finances, quite dramatically in fact: https://obr.uk/box/the-fiscal-impact-of-increases-in-the-sta...
This is the natural consequence of declining birth rates.. it's either that or immigration right now.
Encouraging people to have more children requires drastic changes in society which is difficult to implement.