Until they all get old and dependent on social security. There'll not be a big enough working population to pay into the system for the seniors to draw out, like in Japan. Stuff of economic recessions.
Conclusion: don't Netflix and chill, get moving and make a baby
That the failure of one of those economic model for public healthcare (social security) but what can one expect from a model invented at the time population exploded (baby boomers) and then when emigration was encouraged?
What we need now is another economic model better fitted to the future challenges. For me longer life, AI, neural tools and robots are clearly somewhere in the picture, however I would not like to be in a culture of perpetual holidays where everything is managed by robots and AI.
Augmenting the human being, socially, intellectually and physically is a much better pathway.
"Population aging may pose an economic challenge to governments as the number of retired citizens drawing public pensions rises in relation to the number of workers."
There are too many people using too many resources on our small finite planet. Is good, no?