This is not always true, I was married at age 19 and it was not the right partnership for me, as a matter of fact I missed some huge red flags because I wasn’t old enough with enough life experience to understand who I am and what I really need in a primary partnership. I think it’s fine if people want to wait, take time to get to know themselves, grow up a bit and meet a lot of people, which will teach you much about human personalities and who you will align with. Waiting until you are ready, even if that’s age 50 is best.