您的意思是他过了21岁生日后,他还可以呆到H4有效期结束,只不过这期间就不是H4 身份了,对吗?
-Correct.
如果在他生日之前我们给他file I-539, 从H4转到F1, 在等待F1批准的过程中是不是即使他过了21岁的生日他也可以继续学习?
-Yes. Provide the copy of your H-1 approval notice and your latest 3 month paycheck stubs, the copy of his H-4 I-94, and the I-20 for I-539 filing.