若い（わかい）— young
母 が 若い とき、学生 でした。
When my mother was young, she was a student.
若いわかい
young
わかい
accent [2]In detail
Words
母hahamy mother
がga(subject of the time clause)
若いwakaiyoung
ときtokiwhen
学生gakuseistudent
でしたdeshita(polite past sentence ending)
Kanji
若ジャク・
若い describes being young. 新しい means new; a newly bought object is not usually 若い. The Japanese adjective before とき uses its non-past form here even though English says “was young.”
Coco-sensei