As nouns the difference between terms and seventysomething
is that terms is while seventysomething is (countable|colloquial) a person aged between 70 and 79 years.
As a numeral seventysomething is
between seventy and eighty.
terms
English
Noun
(head)
Statistics
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seventysomething
English
Alternative forms
*seventy-something
Noun
(countable, colloquial) A person aged between 70 and 79 years.
:She was a spritely seventysomething .
Numeral
(head)
Between seventy and eighty.
References
* [http://www.seventysomething.org/about70.html]