
der Siebziger
septuagenarian
A male person whose age is between 70 and 79.
Mein Großvater ist ein rüstiger Siebziger, der noch jeden Tag spazieren geht.
My grandfather is a spry septuagenarian who still goes for a walk every day.
septuagenarian / seventies
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septuagenarian
A male person whose age is between 70 and 79.
Mein Großvater ist ein rüstiger Siebziger, der noch jeden Tag spazieren geht.
My grandfather is a spry septuagenarian who still goes for a walk every day.

seventies
The decade from 1970 to 1979, often in reference to the culture, fashion, or music of that time. In this meaning, the plural is used almost exclusively.
Die Mode der Siebziger ist heute wieder total angesagt.
Seventies fashion is totally trendy again today.
The word is derived from the number 'siebzig' (seventy). This pattern is used for all decades and age groups, e.g. 'ein Zwanziger' (a person in his twenties) or 'die Achtziger' (the decade 1980-1989).
Die Musik der Achtziger ist immer noch sehr populär.
Eighties music is still very popular.
The article and the number (singular/plural) show the meaning. 'Der Siebziger' in the singular is a male person. 'Die Siebziger' in the plural refers to the decade.
Der nette Herr von nebenan ist schon überzeugter Siebziger.
The nice gentleman next door is already a convinced septuagenarian.
When talking about the decade, the preposition 'in' is often used: 'in den Siebzigern' (in the seventies). In texts, the abbreviation 'in den 70ern' is also often used.
In den Siebzigern gab es viele politische Veränderungen.
In the seventies, there were many political changes.
When it is about the decade, the word is often combined with cultural topics such as 'Musik' (music), 'Mode' (fashion), or 'Filme' (films).
Die Mode der Siebziger war sehr bunt und auffällig.
Seventies fashion was very colorful and eye-catching.