Hi, i'll just make my question short. I have a result of ultrasound here, is it possible to know from this result how old the baby is? Thank you!

Yes. The ultrasound machine takes and records measurements. They can calculate to age of the baby. Ask the person who ordered it, they will be able to give you an approximate age of the baby.
First trimester CRL. In the first trimester, crown-rump length of your baby and the gestational sac measurements are the most accurate for dating. This will give your baby's age within a week. If your due date based on your last period is more than a week off, your due date should be changed. The second and third trimester ultrasound measurements (femur length, head and abdominal circumference) are less accurate.