Try and prove me wrong

It is real. Check it out.
1. Take the last digit of your phone number.
2. Multiply it by 2
3. Add 5 to it
4. Multiply the answer by 50
5. Add 1765
7. Subtract your year of birth
Answer you get must be three digits.
- The first digit is the last digit of your phone.
- The last two digits is your AGE!!
Check and prove me wrong!