midseventies en · NOUN
Etymology
From mid- + seventies.
Meanings
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(plural, plural-only) The middle years of the 1970s.
In the midseventies, just as the Naughton-Peterson stories were becoming popular, surfers everywhere were becoming familiar with Uluwatu, a glistening temple-fronted break located on the southwest corner of Bali.
2011, Matt Warshaw, The History of Surfing, page 305:
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(plural, plural-only) The middle years between 70 and 80 years old.
Teng himself, now in his midseventies, had moved in and out of limbo several times.
1958, Harold Robert Isaacs, Scratches on Our Minds: American Views of China and India: