Psychologists today recognize childhood as a separate stage of life which can only be understood in its own terms, and they wonder why the Western world took so long to see the folly of regarding children simply as small, inadequately socialized adults.
Conclusion (therefore)
Serious research into the unique psychology of advanced age has become indispensable.
Evidence
Old age is as different from young/middle adulthood as childhood is.
Psychologists already accept that childhood is a separate stage of life that must be understood in its own terms.
But most psychologists treat 70-90 year olds as just middle-aged people with extra leisure.
Evaluate
If the answers are the typical conditional form we see on Principle-Strengthen, then we know the outcome should be something like,
"we need serious research into advanced age pschology"
In terms of the trigger, which should match up with something we know from the evidence, what do we know about advanced age?
It's as different as childhood is from those middle stages of life. Psychologists persist in thinking of advanced age as a slightly different version of those middle stages.
Goal
Find a principle where the trigger would apply to advanced age / the psychology of advanced age, and where the outcome sounds like it's saying "we need serious research in this area".