Till recent years, engineers, architects used a big white sheet and a big mechanical scale called a drafter to draw 2D & 3D drawing. 3D drawings were represented in an isometric way with hidden edges. It is still being used by traditional companies even though it is very cumbersome. Although it is very easy to understand and create for professionals, a person new to the industry will find it hard to even draw a simple figure. Computer aided designing or simply known as CAD then came into existence and with it 2D designing was born in the 1960s.
Later, CATIA, which was an integration between CAD & CAM (computer aided manufacturing) was introduced. In 1982, AUTOCAD, a 2D software was created by parent company AUTODESK and it has ruled the designing software world since then. Nowadays we have hundreds of options such as ANSYS, Blender, Tinkercad, etc.
3D designing is used by almost all industries such as Mechanical, Aerospace, Medical, Automobiles, Space, Electronics, etc. 3D designing allows the designer to even design moving components and hence it has reduced the time involved in creating separate designs for complex components. To make a career involving designing in any of the fields related to STEM then learning 3D designing software is a must. It will provide you with an added advantage over your colleagues. What was once an optional course is now a necessary skill in this technology driven world. A resume of a graduate has more weightage if it shows of any certification course.
Many institutes across the country provide short term, long term, professional & crash courses in multiple 3D designing software. There is no age limit for enrolling in any such course. Some learn it during their school days while some upgrade their skills in a professional setup. As mentioned above, industries are being driven by technology and they would prefer someone with adequate knowledge of computer-aided design. There is so much requirement of manpower in 3D designing that it has spurred tremendous growth in jobs related to teaching such design courses.
So, if you have even the slightest inclination towards designing, take up a basic course here, and then assess your career goals.