你是在哪个城市呢?
我上网搜了一下，发现即使同一省份，年龄要求也不一样。比如卡尔加里的年龄分割线是在3月，要求是：
age requirements
A child who turns four years old on or before March 1 may attend Kindergarten in the fall of that same calendar year. Kindergarten is an optional program. Parents decide whether to register their children in Kindergarten.
A child who turns five on or before March 1 is eligible to begin Grade 1 in that same calendar year.
A child who turns six by September 1 must start school.
3月1日满4岁的孩子，那一年9月就可以上Kindergarten。要延迟上学也可以，不过最迟6岁一定要开始上学。
同一省份另一个较小的城市，分割线却是12月：
Students beginning kindergarten must be at least five years old by December 31 of the school year they are registering for. Students starting grade one must be at least six years old by December 31 of the school year they are registering for.
不过这里的伸缩性很大，很多本地人都选择迟一年上学，所以不必担心跳级的问题，要跳就跳，不要跳就不必跳。
悄悄跟大家说哦，这里的虎妈觉得让孩子迟上学才占优势
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