A social security card is one of the conditions that must be owned as an identity as well as a driver license and ID card. The social security cards owned by each country have different regulations and benefits. The contents of the social security card are made based on data related to the ID card. If you have a social security card, it indicates that you are responsible enough for life-related to the environment and even your work. Some workplaces require employees to have a social security card as a sign that you are a legal citizen.
To be able to have a social security card, you must be of the age enough to take responsibility for yourself. This means that whatever action you take, it is no longer the responsibility of your parents or relatives but yourself. This is proven legally by the existence of social security cards and other legal documents related to identity. Usually, when you get a structurally good job within the company, you'll have social security cards automatically.
Getting a social security card takes time to process. Even though it is said that you will receive it automatically, there is a period of time needed for collecting data, verification and printing it into a card. Usually, the social security card takes about 2 weeks to be used and active. However, this time has differences in some countries. Not all bureaucratic affairs in every country have the same speed. Therefore, it would be better if as soon as you get a job to register it directly with the part of the government where you live or work.
The options you have when you don't have a social security card are several other ID cards such as employee ID cards, School ID cards, Medical Cards, even Military Cards (if possible to have them). These cards can already represent the function of the Social Security Card related to identity. If your age is not enough to make these various types of cards, it will not be a problem for you because there is indeed a minimum age limit for processing Social Security Cards and other cards. The conditions that allow for this optionality are when you are old enough, but your Social Security Card is in the process of creating and extending the card period.