This is the 6107th most frequent Turkish word.
yetişkin
"Yetişkin" means "adult" in English.
In this sentence, 'yetişkin' is used metaphorically to refer to the maturity of a fruit tree.
Bir meyve ağacı, olgunlaştıktan sonra yetişkin olur.
A fruit tree becomes mature after it ripens.
Here, 'yetişkin' is used to describe human beings who have reached adulthood.
Yetişkin insanlar, genellikle daha sorumlu davranır.
Adults usually behave more responsibly.
In this instance, 'yetişkin' specifies the intended age group for the movie's audience.