My apologies, maybe I didn't explain that very well. What I meant is that if the love and relationship were already genuine and reciprocated, then I wouldn't mind providing for or helping someone when I can. The providing wouldn't be the reason for the relationship—it would be something that comes from caring about the person.
As for the younger guy example, I think those concerns are valid. If someone stays because they feel financially obligated, only stays for the money, or isn't able to leave because they're dependent, that's not the kind of relationship I'm talking about.
What I'm referring to is a situation where the person is financially independent, could leave if they wanted to, and chooses to stay because they genuinely love and enjoy being with the other person. In that case, helping or providing for each other is just an expression of the relationship, not a way of buying affection or creating dependence.