This is in part due to the fact that people who have children differ, on average, from those who do not have children in ways that are related to happiness, such as in their marital status, age, and income.
They also feel less stress, are more fun to be around, are more optimistic, and enjoy their lives more than people who are unhappy.
People don’t care about the expensive clothes you wear, how big is the house you own or the car your drive. That’s not to say that they don’t respect your achievements or possessions.