Im now 76 and have a good rub usually twice per week. Up until about 2 yeras ago, my wife and I had real sex about once a week but due to arthritus in her knees and hips she found it painful in the joints.
as I have grown older the amout of ejaculate has diminished and sometimes although I get a good orgasm when jacking off, there is very little eruption.
Although my wife may no longer like me on top, she does enjoy a good hand job on her clit and labia and allows me lie beside her and bring myself off when we wre finished rubbing her.