T: 十九 S: 十九 [shi2 jiu3] = nineteen, 19
她在十九歲時成了化學學士。
她在十九岁时成了化学学士。
ta1 zai4 shi2 jiu3 sui4 shi2 cheng2 le5 hua4 xue2 xue2 shi4.
She became a Bachelor of Chemistry recipient at the age of nineteen.
https://www.learnwitholiver.com/chinese/daily-sentence-3829