YSK for people who feel like they need to get married before the age of 30: the average age of people getting married increases over time, so getting married after 30 is natural and there's nothing wrong with that
from /r/YouShouldKnow
对于那些觉得需要在30岁之前结婚的人来说，YSK：随着时间的推移，人们结婚的平均年龄会增加，所以30岁以后结婚是很自然的，这没有什么不对。