der Jahrgang
year group
All people who were born in the same year.
Mein Großvater und sein bester Freund waren derselbe Jahrgang.
My grandfather and his best friend were from the same year group.

vintage / cohort
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year group
All people who were born in the same year.
Mein Großvater und sein bester Freund waren derselbe Jahrgang.
My grandfather and his best friend were from the same year group.

The word is made up of 'Jahr' (year) and 'Gang' (course/group). It describes a group or set that belongs to a particular year, like a 'course' of people or products from one year.
Der Jahrgang 2020 gilt als exzellent für diesen Winzer.
The 2020 vintage is considered excellent for this winemaker.
Very often, 'Jahrgang' is combined directly with a year to define the group precisely. The year then usually comes directly after the word.
Mein Vater ist Jahrgang 1965.
My father was born in 1965.
You can always recognize the exact meaning of 'Jahrgang' from the context. Words like 'Wein' (wine), 'Flasche' (bottle), or 'Winzer' (winemaker) point to wine, while 'Schule' (school), 'Klasse' (class), or 'Abschluss' (graduation) refer to students.
Der ganze Jahrgang fährt auf Klassenfahrt.
The whole year group is going on a class trip.
When referring to people, 'Jahrgang' is often combined with adjectives like 'stark' (strong) or 'schwach' (weak) to describe the size or abilities of the group.
In diesem Sport gilt der Jahrgang 2005 als besonders stark.
In this sport, the 2005 year group is considered especially strong.
In connection with wine, you often hear about a 'guter Jahrgang' (good vintage), 'schlechter Jahrgang' (bad vintage), or 'Spitzenjahrgang' (top vintage). These describe the quality of the wine from a particular harvest year.
2018 war in dieser Region ein Spitzenjahrgang für Weißwein.
2018 was a top vintage for white wine in this region.
year
'das Jahr' and 'der Jahrgang' are easy to confuse because both have to do with a specific year. 'Jahr' means the period of twelve months or a specific calendar year. 'Jahrgang', on the other hand, means a group or collection that belongs to the same year: people with the same birth year, students from the same starting year at school, wine from a particular year, or issues of a magazine from one year. Remember: 'das Jahr' is the time period; 'der Jahrgang' belongs to that time period.

Herr Müller ist Jahrgang 1980.
Mr. Müller was born in 1980.
Im Jahr 2024 hat Sarah ihre Ausbildung begonnen.
Sarah began her training in 2024.