This is the 10892nd most frequent Swedish word.
livslång
"Lifelong."
Here, 'livslång' is used as an adjective describing a characteristic (lifelong) of the abstract noun 'kärleken' (the love).
Kärleken mellan dem var livslång.
The love between them was lifelong.
In this example, 'livslång' modifies 'utveckling' (development), indicating it as a continuous and enduring process over one's life.
Hon strävar efter livslång utveckling inom sitt område.
She strives for lifelong development within her field.
Here, 'livslång' functions as an adjective for 'resa' (journey), emphasizing the concept of education being an ongoing endeavor throughout life.