Arguably one of the benefits (or even reasons) for increased longevity is precisely for the reasons mentioned above - the long space flights that will be needed to colonise other planets. or even just a decent career in the space industry. I can't think of any other advance in transport (and thus advances in all connected lifestyles, for want of a better word - someone (probably R. Buckminster Fuller) once coined: 'livingry') that has had less enthusiasm from the public, despite the moon landings. Boats, wagons, trains, bikes, cars, planes and everything up to spacecraft were gleefully adopted by everyone, and the democratisation of travel has always been the definition of 'progress'. Yet even with the popular interest in space in movies and TV, the overall enthusiasm for the 'next step' is relatively low amongst the public - possibly as there's nowhere obvious yet 'to go'. Not even boldly, where no man has been before.
However, space will need a huge amount of infrastructure to construct, and will undeniably need a lot of labour to do that. How many people have they thrown at that shit-stupid 'World Cup' stadium complex in Qatar? And for what? If it even goes ahead it'll be empty now. All the technologies that support the space industry will need a lot of labour to make all the components and widgets and more trivial items that go into every programme. There are plenty of companies in Britain quietly making a good living making plastic components, lighting units, ventilation systems and nutrient solutions for the hydroponics industry - which occasionally also grows salad and strawberries amongst its bulging repertoire. They're not struggling, as they've identified a 'growing' market and gone for it - and only make components, so 'it wasn't me, guv'.
The US had the money and the skills to begin building a moonbase in the early 1980s until Ronald Reagan diverted the entire budget to his 'Star Wars' laser-weapons program - which, predictably didn't work, and just pissed everybody off so they didn't want to work with them. If they had started work on the moonbase then, arguably they would probably be hiring rather a lot of labourers right about now to begin building the first 'moontown', starting of course with bars, casinos and brothels. What else are those labourers going to do with their spare time?
Speaking of spare time, anything by R. Buckminster Fuller is well worth reading:
https://en.wikipedia.org/wiki/Buckminster_Fuller
He also produced the only map to show the Earth as it really is, with no deformation anywhere. Strangely it never gets mentioned, probably as it has 'funny edges'. It's on my wall above my desk here:
https://www.bfi.org/about-fuller/big-ideas/dymaxion-world/dymaxion-map