What Causes Reduced Strength And Stiffness Of Penis During Intercourse?

i AM 60 YRS OLD. I HAVE A SMALL PENNIS ABOUT 4 INCHES BUT IT DID NOT POSE A PROBLEM TO MY MARRIED LIFE. NOW A DAYS THE STRENGTH AND STIFFNESS IS REDUCED. WHAT SHOULD I DO TO MAINTAIN A HEALTHY AND STRONG PENNIS . HOW FAR PENNIS ENLARGMENT OIL AND CREAM IS EFFECTIVE. WHAT SHOULD I DO TO HAVE HEALTHY SEX.