My mom is 52 and we have regular sex. She lives alone in an isolated town. We only started having sex a couple of years ago when she confided in me she really needed it. We just did it on the sofa with her skirt pushed up. It was spontaneous but exciting. She waits for me on Saturday mornings now, and will even dress in her lingerie for added excitement.
That's it, fuck your mom and be sure to cum in her pussy so she can feel you pumping your seed deep into her willing body where you both want it and know that it belongs in there. Family sex is great.