I think the answer will be including dialogue. Hope it help!
The subject of a talk, a piece of writing, a person's thoughts, or an exhibition; a topic.
Bruno's train was comfortable with few people, while the train on the other track was crowded and uncomfortable.
Answer:
"I'm still young, but I work on my memory daily so I don't become senile."
Explanation:
Senile means denoting to old age and that sentence correctly uses it
