This is a Javanese keris blade, the form (dhapur) appears to be pandowo cinarita, the pamor motif is wos (or beras) wutah. In respect of age, my estimate would be 19th century. In the majority of cases it is not possible to place a reasonably accurate age onto a keris blade. It is probably classifiable as a Mataram style blade, which refers to the area of Central Jawa where it was probably made, but that Mataram era covers a few hundred years.
The scabbard is a Jogjakarta form, I cannot see sufficient detail of the hilt to comment.
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