middle-aged
US /ˌmɪd.əlˈeɪdʒd/
UK /ˌmɪd.əlˈeɪdʒd/

1.
среднего возраста, пожилой
being in the period of life between youth and old age, usually considered to be from about 45 to 65
:
•
My parents are both middle-aged.
Мои родители оба среднего возраста.
•
The survey targeted middle-aged professionals.
Опрос был направлен на специалистов среднего возраста.