This is the 1876th most frequent Turkish word.
gençlerin
"Gençlerin" means "of the young people" or "the young people's" in English.
Here, 'gençlerin' is used in a possessive/genitive form to denote 'of youngsters'.
Gençlerin spora olan ilgisi artıyor.
The interest of youngsters in sports is increasing.
In this sentence, 'gençlerin' indicates the possessive relationship with the action (reading) attributed to the youngsters.
Bu kitap gençlerin okuyabileceği seviyede hazırlanmış.
This book is prepared at a level suitable for youngsters to read.
In this example, 'gençlerin' expresses possessive association with the meeting, denoting ownership or relation.