In season 3 Ward says Beaver is 10 years old. My guess is at the time Jerry is 11 and in the fifth grade.
Season 3 would probably have been filming starting in early to mid 1959. In June of that year Jerry turned 11 in June. So he was 11 playing 10.
He appeared pretty small for an 11 year old but had a growth spurt starting in seasons 4 and 5--so they couldn't cheat his age as easily. Probably why they skipped grade 7 in the show and sent him from grade 6 in season 5 to grade 8 in season 6.
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