I'm a native, but I think you can say... He is as old as... but, to go to school, in this case, sounds weird for me!
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jooney"He is so old as to go to school."No, it doesn't sound natural and I'm not sure what it means. "He is old enough to go to school" is fine. Is that what you want to say?
1. Does this sentence sound natural to a native speaker's ear?