The answer will depend on where you live. People finish high schools at different ages in different parts of the world.
66
15th birthday in 2017
36 + 17 = 5353rd birthday is in 2017
You would turn 661 in 2017.
You would now (24 July 2017) be 33 years old.
2017 − 1961 = 56 years old on the person's birthday in 2017.
37 years old in 2017
62
If you were born in 1999 you would graduate from high school in the year of 2017.
what year did i start high school if i graduated in class of 2005
2017 or 2018, assuming you weren't held back.
You would graduate in the year of 2016.
You are 2017 - 1982 = 35 years older than the age at which you graduated.
August 7, 2017 will be the first day of school in the 2017 -2018 school year for students in the Metro Nashville School District.
June 2, 2017 was the last day of school in 2016 -2017 for students in the Boise School District.
Current (2016-2017) cycle will end on July 18, 2017.
June 8, 2017 was the last day of school in 2016 -2017 for students in the Indianapolis School District.
In the US, at least, "the class of " is universally understood to mean "the class that graduated/will graduate in the spring of ". People that graduate at a different time than the rest of the class are normally considered to keep the same class year, as long as they're not graduating a full school year before or after the rest of their class. So if throughout your school years you've been in the "class of 1980" based on starting Kindergarten in fall 1967, but you actually complete your graduation requirements in November 1979, you're still "class of 1980" rather than "class of 1979". However, if you skipped a grade back in elementary school ... or were held back a year ... your class year would shift accordingly.To address your specific questions, the Class of 2021 will graduate high school in spring 2021, and if you graduate in school year 2016-2017 you will be Class of 2017.