Just for the benefit of the readers, I'm gonna make this first chapter just a quick little reference guide for the timeline in my headcanon. I've used it constantly while writing these drabbles. I mostly use it as a frame of reference for how old the characters are in relation to what year/month the drabble takes place in.
For reference, I think the original Peanuts canon (whether you're counting the strips or the animated specials) takes place from when the characters are 4 or 5 until they're about 9 or 10. So 1952 thru about 1958, give or take.
First, birthdays:
Schroeder's birthday - January 18th, 1947
Lucy's birthday - April 10th, 1947
And now school years and the ages they are AFTER THEIR BIRTHDAYS each year:
1952 - 5 yrs - Kindergarten thru 1953
1953 - 6yrs - 1st grade thru 1954
1954 - 7yrs - 2nd grade thru 1955
1955 - 8yrs - 3rd grade thru 1956
1956 - 9yrs - 4th grade thru 1957
1957 - 10yrs - 5th grade thru 1958
1958 - 11yrs - 6th grade thru 1959
1959 - 12yrs - 7th grade thru 1960
1960 - 13yrs - 8th grade thru 1961
1961 - 14yrs - 9th grade thru 1962
1962 - 15yrs - 10th grade thru 1963
1963 - 16yrs - 11th grade thru 1964
1964 -17yrs - 12th grade thru 1965
1965 - 18yrs - college freshmen thru 1966
1966 - 19yrs - college sophomores thru 1967
1967 - 20yrs - college juniors thru 1968
1968 - 21yrs - college seniors thru 1969
1969 - 22yrs - master's degree 1st year thru 1970
1970 - 23yrs - master's degree 2nd year thru 1971
After that, I don't have a chart, but I hope this is helpful!
