What you are experiencing is normal and it has to do with one's natural drop in your libido as you age.
Men are visual creatures when it comes to sexual stimulation. That's why things like porn or seeing women in sexy lingerie are always so appealing.
As your libido declines, you need more sensory stimulation in order to achieve arousal. In the case of most men that means more visual stimulation. The activities that still provide you with that arousal, still provide satisfaction, while activities that are lower down the list when it comes to visual stimulation, are less satisfactory. What we all find visually stimulating varies dramatically between individuals and that's why what arouses one 65 year old man, may not arouse another. It is not surprising that you continue to enjoy sexual activities that include a certain amount of visual stimulation such as watching a beautiful woman suck your cock or mutual masturbation
A close second for many men is touch. That's why a lot of guys, as they get older are just as satisfied with a nice relaxing Rub n' Tug as they would be with a FS session. Some enjoy it more.
These are all natural changes. Rather than being concerned about them, recognize, which ii sounds like you have, the ways in which you now enjoy the company of a woman and forge ahead accordingly.
To be honest, most women have trouble having a truly great orgasm from just intercourse. Those I've been with would rather we engage is some well executed DATY, 69, mutual masturbation and kissing rather than me just pounding on her pussy for 20 to 30 minutes.
Cheers
J