"The financial expert previously cautioned that people in their early 20s today will likely have to work well into their 70s or even 80s because they won't be able to squirrel enough away to retire.". ....... what supposition is this. the savings rate is now at 12%of wages. this will ensure at least $500k over 45 years. even on low wages this will amount to reasonable retirement income on present day values.
but of course they'll also have many pay rises, advances in their occupation, seniority over time. but equally there'll be plenty of hazards to skirt around including AI and robotics taking over lower income and middle income jobs. as a result of this the superannuation system might collapse when Govt is compelled to institute a UBI. in which case, the superannuation sum will simply be a boon for travel.
