Intense pressure on individual values has significantly changed human opinions, even in giving birth. There is no doubt that the maternal age is currently increasing years by years which means people choose to have babies in the later life more than at their young age. There are both pros as well as cons of this changing, though I do believe that this has more benefits than drawbacks.
Giving and raising a child are clearly the most difficult challenges for the younger who is, following the arrow of time, prone to prioritise their personal life rather than spending almost lifespan for the family building. They have more concerns like their own career, health protection, travelling, etc. Having a baby might cause an unexpected impact to their future goals due to lacking of time for doing a project or doing multiple job tasks on time. Time for travelling and social building will be reduced if your sons or daughters need you to help their extra-curriculum activities. Not only your usual time schedule but also your freedom would be seriously limited.
Moreover, through their actual life, the adults strongly understand that the cost for bringing up children is quite high compared to their income. In Vietnam or Asian countries, being parent means that you have to pay the variety of fee for your child from their early life to at least when they graduate from their high school without government incentives, and at the same time, you must be worried about your family bills. Caring a child also requires time and many parents couldn't have time and expenditure for their health or appearances. As the matter of fact, young people argue how they could afford a child while they have not still sure whether their salary can be enough for the basic needs of both family members. Therefore, more and more couples do not desire to put more pressure to their personal life by raising a child too early.
Like the other side of coin, the outcome of having a baby too late is not a good idea for women and children health. Beside of possible miscarriage, new-born child may have been affected by the high risks of inborn diseases such as Down syndrome. Many scientists indicate that women giving birth at the age over 35 are more likely to easily get diabetes compared with the young mother. Consequently, these impacts may cause a stress for public health care.
In the nutshell, giving a birth late is the personal decision depending on many factors. If we are maximizing the development of individualism, this tendency absolutely brings more advantages outweighed the disadvantages.