This is the 564th most frequent Swedish word.
ålder
Age.
In this sentence, 'ålder' refers directly to a specific person's age in terms of years.
Min ålder är trettio år.
My age is thirty years.
Here, 'ålder' is used to denote a general stage in life associated with a typical activity or event.
Vid den här åldern brukar barn börja skolan.
At this age, children usually start school.
In this usage, 'ålder' refers to the broader concept of aging or being in different life stages.