This is the 11337th most frequent Russian word.
десятилетние
"Десятилетние" translates to "ten-year-olds" in English.
The word 'десятилетние' is used as an adjective describing children by their age, specifically ten years old, and refers to multiple children.
Десятилетние дети играли на детской площадке.
Ten-year-old children were playing on the playground.
Here, 'десятилетние' serves as a modifier relating to a time period referring to decades, linking the noun 'годы' (years) to a representation of ten-year periods.
В музее было много экспонатов, созданных десятилетние годы назад.
In the museum, there were many exhibits created ten years ago.
In this context, 'десятилетним' (the adjective form in dative case) modifies 'юбилеям' (anniversaries), denoting that the anniversaries mark ten years.