die Altersgruppe
age group
A group of people who are of a similar age.
Das Spiel ist für die Altersgruppe von sechs bis zehn Jahren geeignet.
The game is suitable for the age group from six to ten years old.

age group
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age group
A group of people who are of a similar age.
Das Spiel ist für die Altersgruppe von sechs bis zehn Jahren geeignet.
The game is suitable for the age group from six to ten years old.

The word is clearly composed of 'das Alter' (age), the linking -s, and 'die Gruppe' (group). So it literally describes a group defined by its age.
Für jede Altersgruppe gibt es passende Freizeitangebote.
There are suitable leisure activities for every age group.
To define the exact range of an age group, the structure 'die Altersgruppe von ... bis ... Jahren' (the age group from ... to ... years) is used.
Der Kurs richtet sich an die Altersgruppe von 18 bis 25 Jahren.
The course is aimed at the age group from 18 to 25 years old.
Common verbs used with 'Altersgruppe' (age group) are 'ansprechen' (to appeal to), 'sich richten an' (to be aimed at), or 'geeignet sein für' (to be suitable for), in order to describe the target group of a product or offer.
Die Werbung spricht gezielt eine jüngere Altersgruppe an.
The advertisement specifically appeals to a younger age group.
generation
'Generation' and 'Altersgruppe' both describe people of a similar age. But 'Generation' means more than just age: it is also about the shared time in which people grew up and about similar experiences. 'Altersgruppe' is more neutral and practical. It is often used when dividing people by age, for example in studies, courses, or offers. The words can be confused because both have to do with age. If you are talking about history, family, or shared experiences, 'Generation' fits better. If you only mean an age level, 'Altersgruppe' is more precise.

Der Kurs ist für die Altersgruppe von 12 bis 15 Jahren gedacht.
The course is intended for the 12-to-15-year-old age group.
Unsere Generation ist mit Smartphones und sozialen Medien aufgewachsen.
Our generation grew up with smartphones and social media.