I am 69 and have an active and satisfying sex life with my fiance. He is 68. People are different. She can give you pleasure without you doing anything. You can give her pleasure. Maybe she is n't interested. Some women aren't.
Most people like to have sex, if they have a good time. Maybe she is bored, mad at you, in pain, doesn't feel cute or noticed. Who knows? She may not even know.
Talk to her about it. If you can't talk about it, you aren't intimate enough for sex anyway.
Go to a marriage counselor, and go alone if you have to, and talk about it. Hopefully, your relationship is deeper than just sex every week, but you ought to be able to negotiate.
Like, I will do dishes for a week if you give me a BJ. Or I will leave you alone, if you let me kiss you and hug you during a movie.