Has anyone noticed this trend about couples who meet young?

I’ve noticed that a lot of posters who have been waiting for 5-10 years met their partners as teenagers or in their early 20s. During this time, they complete their schooling, move in together (or move to be with their partner), buy property, adopt pets, or even have kids. Once they hit their late 20s or early 30s, OP starts asking about marriage and their partners reveal their commitment phobia or lack of desire to be with them long term. Eventually, the couple breaks up but their peers in the same age group are starting to settle down. On the outside, the relationship might appear to hit specific milestones, but the core of the relationship is emotionally or mentally stagnant. One or both people haven’t critically thought about what they want out of life. On the other hand, couples who meet at a later age are less likely to stay stagnant for as long. Thoughts on this?