Why does Janie say she and Tea Cake should not date?

Janie cites the fact that Tea Cake is too young for her and likely after her money.... she thought it probable he was the type to live with her without benefit of marriage.

Janie wanted to ask Hezekiah about Tea Cake, but she was afraid he might misunderstand her and think she was interested. In the first place he looked too young for her. Must be around twenty-five and here she was around forty. Then again he didn’t look like he had too much. Maybe he was hanging around to get in with her and strip her of all that she had. Just as well if she never saw him again. He was probably the kind of man who lived with various women but never married.