这个年纪说爱太烫嘴
[zhè gè nián jì shuō ài tài tàng zuĭ]
Literally means 'At this age, talking about love burns the mouth.' It expresses that mentioning love at a certain point in one's life is too awkward and hot-topic-ed—metaphorically implying discussing such emotions is too risky or premature given where one is currently at their life path or stage.