The difference between Grey power and Senior citizen
When used as nouns, grey power means the collective political, economic, and social influence of senior citizens, especially when they are mobilized by a common interest, whereas senior citizen means an old person, variously considered to be a person over fifty, fifty-five, sixty, or sixty-five years of age.
check bellow for the other definitions of Grey power and Senior citizen
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Grey power as a noun (chiefly, UK, Canada, Australia, idiomatic):
The collective political, economic, and social influence of senior citizens, especially when they are mobilized by a common interest.
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Senior citizen as a noun:
An old person, variously considered to be a person over fifty, fifty-five, sixty, or sixty-five years of age.
Examples:
"synonyms: senior q1=US older adult q2=euphemism pensioner"
"coordinate terms pensioner retiree"