middle-aged

US /ˌmɪd.əlˈeɪdʒd/
UK /ˌmɪd.əlˈeɪdʒd/
"middle-aged" picture
1.

trung niên, tuổi trung niên

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.
Bố mẹ tôi đều là người trung niên.
The survey targeted middle-aged professionals.
Cuộc khảo sát nhắm vào các chuyên gia trung niên.