The generation of people who are of childrearing age face great economic burdens which has led to a declining birthrate.
この場合、次のような言い方ができますよ。
ーThe generation of people who are of childrearing age face great economic burdens which has led to a declining birthrate.
「子育て世代は大きな経済負担に直面し、それが少子化につながっている」
generation of people who are of childrearing age「子育て世代」
economic burdens「経済負担」
a declining birthrate「少子化」
ご参考まで！
カナダ 
