Hi

Your profile suggests that you are class 12th btech/engineering aspirant

Actually, there's no fixed age to complete your 4 year graduation. Also there are students who take drop after 12th .

Anyway,

In general, student's age when they pass 12th is 17 years , so by the time they complete 4 years of graduation, they become 21 years old.

So, we can say that in general 21 years is the age when students complete 4 year graduation.

To help you further,

As you are an engineering aspirant

Here's the complete details about Engineering i. e BE/BTech

---------------------)  BTech/BE

BTech ( Bachelor of Technology ) or BE ( Bachelor of Engineering) is a 4 year degree course divided into 8 semesters. You have different branches in BE /Btech like computer science, IT, ECE, Mechanical, electrical etc. You can get list of top branches at:-

https://engineering.careers360.com/articles/top-engineering-branches-in-india

---------------------) ELIGIBILITY CRITERIA

• Qualifications required :-  To be eligible you need to pass 12th with Physics and   Mathematics as compulsory subjects along with any one of Chemistry /Biotechnology/Biology/Technical Vocational subject.

• Minimum percentage required in 12th:- In general you need at least 45 % for general category and 40 % for sc/st in 12th in physics , maths and   Chemistry /Biotechnology/Biology/Technical Vocational subject taken together  to be eligible.

For example,

To be eligible for BTech in Rajkiya Engineering College, Bijnor , a government engineering college, one needs to pass 12th with Physics and Mathematics as compulsory/mandatory subjects along with one of - Chemistry or Biotechnology or Biology with at least aggregate of 45% marks (40% if you are from reserved categories ) in these subjects.

You can check the same by visiting our page for which link is given below :-

https://www.careers360.com/colleges/rajkiya-engineering-college-bijnor/btech-computer-science-and-engineering-course

But yes,

To be eligible for top colleges like IITs, NITs, IIITs, CFTIs etc you need at least 75 % in 12th and 65 % in case if you are from sc/ st .

---------------------) ADMISSION PROCESS

Admission in most of the engineering colleges is through Entrance examinations including top government colleges like IITs, NITs, IIITs etc and private ones like BITs Pilani, VIT etc

• So to get admission you need to appear in entrance examination

• Qualify the entrance examination

• Participate in counselling

• In the counselling you will alloted a seat on the basis of your rank in entrance exam, category etc.

• After seat allotment you need to get your documents verified and pay fees and finally you get admission in the college.

While there are some colleges which provides admission in BTech on class 12th marks basis

For example,

Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam offers admission in btech on the basis of 12th marks. For details checkout:- You can get the complete information by visiting its our page for which link is provided below

https://www.ssn.edu.in/college-of-engineering/admissions-b-e-b-tech-admissions/

---------------------) TOP ENTRANCE EXAMS

List of top engineering entrance examination is given below :-

• JEE main and JEE advanced

†††† Jee main is the most widely accepted entrance examination. In addition to NITs, IIITs, GFTIs, it is also accepted by several state government engineering colleges and also by numerous private engineering colleges.

You can appear in JEE advanced examination only after qualifying Jee main and it is your gateway to IITs

• West Bengal Joint Entrance Exam (WBJEE)

• Birla Institute of Technology and Science Admission Test

• SRM Joint Engineering Entrance Exam (SRMJEEE)

• VIT Engineering Entrance Exam (VITEEE)

• Amrita Entrance Examination - Engineering (AEEE)

• Consortium of Medical, Engineering and Dental Colleges of Karnataka Under Graduate Entrance Test (COMEDK UGET)

• Karnataka Common Entrance Test (KCET)

• Guject i. e Gujarat Common Entrance Test

• Andhra Pradesh Engineering Agriculture and Medical Common Entrance Test (AP EAMCET)

• Telangana State Engineering Agriculture and Medical Common Entrance Test (TS EAMCET)

• Symbiosis Entrance Test (SET)

• MHTCET

• BITSAT

To get the complete list go through

https://engineering.careers360.com/exams?sort_filter=pop

---------------------) TOP ENGINEERING COLLEGES

The list of top engineering colleges  is provided below:-

• IIT Madras

• IIT Delhi

• IIT Bombay

• IIT Kanpur

• IIT Kharagpur

• IIT Roorkee

• IIT Guwahati

• IIT Hyderabad

• National Institute of Technology Tiruchirappalli

• NIT Karnataka, Surathkal

• IIT ISM Dhanbad

• Vellore Institute of Technology, Vellore

• Indian Institute of Technology Indore

• IIT BHU Varanasi, Uttar Pradesh

• Institute of Chemical Technology, Mumbai

• Amrita Vishwa Vidyapeetham, Coimbatore

• Jadavpur University

• Anna University, Chennai

• Indian Institute of Technology Ropar

• National Institute of Technology Rourkela

You can get the complete list of all the top engineering college which you can go for for your BTech are listed below

https://engineering.careers360.com/colleges/ranking

---------------------) AVERAGE PACKAGE/salary

Average package is 3 to 8 lakhs per annum while highest package can go even upto 1 crore in top IITs. Salary mainly depends upon the  skills you gain, brand value of the college from which you have pursued your btech, the branch you are from, in general for computer science salary goes relatively righer, the company you get placed in etc

For more details checkout:-

https://www.careers360.com/courses/b-tech-bachelor-of-technology

Thank you