A severe illness when she was just 19 month old deprived the well-known writer and lecturer Helen Keller of both her sight and her hearing.
19 month old→ 19-month-old
句意：一场大病在著名作家、演讲家海伦• 凯勒19个月大时夺去了她的视力和听力。表示岁数时，其表达为“数字-日/月/年-old”。