nowadays in several Western countries not having children become more popular and there are benefits and drawbacks.
On the one hand, younger couples prefer being freedom and financially independent. They can spend time together, traveling and also focus on career or education. When it comes to children the first thing they think is having more money, more time to spend with them and less time for sleep or themselves. Moreover, many people are not mature enough at a young age. And they need time for development growing and understanding what they really want.
On the other hand , several couples thinking longer not because of understanding, but due to non-confidence. And in the future they may feel more lonely, they may want feel love not only from partner or parents but also from children, feel emotional connection with children. Of course it is not about people who categorically do not want a child, it is about people who wants but do not have. And also they might see the children outside , notice their happiness, their relationship with parents and catch themselves thinking, that they become better parents than others.
In conclusion, having children and being parents is individual. It is up to each person. And if people prefer freedom and are not ready to share time and money it better to stay childless but some couples still love being parents, take care of younger generations and looking after them. But for both it is good to think and understand what they really want before deciding something.