Wife not self conscience about the 20 year age difference. If the young buck gets hard, he must physically and mentally enjoy what he's getting. So as a mature couple, next MFM, get your wife a 29 year old fellow.
When you see your wife taking anal from your best friend for the first time. You could see his balls slapping against her pussy. She did look back at you a couple times to make sure everything was okay with you. She was a little concerned you'd get jealous seeing her surrender her ass to another cock.
Part of the Stag/Vixen relationship is watching your wife "perform". So when you find another male you leave them go at it for awhile. Your 58 year old wife really took the young cock, and looks like she even reached back to spread her pussy a little more for him.