Erection problem... I am also 60 plus and I do intercourse regularly twice a week and have never used any tablet or medicine.Though my penis is not as hard as it used to be 20 or 30 years back.My advice is as follows:
1) You should be very relax and stress free before inercourse.
2) Do not put any pressure of penetration or intercourse on your mind.
3) Keep rubbing your penis over your wife,s vagina for 5 to 10 minuites, it will eventually get harder and harder and will enter into her vagina.
4) Use condom for some times, it will delay the discharging process.
5) Put a rubber ban over the shaft (Base ) of your penis, it will keep erection for a longer time.
6) Spend more and more time on foreplay, kiss every part of her body.
7) Take your wife into full confidence... Love her immensely and pasionately.
8) If again erection fails , dont get upset it will come back eventually.
The bottom line is love, affection and sincerity which will bring your erection back and will continue to mainatain your erction tall you are in your seventies or eighties.