Your milking scenario is enough to start any engine let alone early detonation.

Dear Carolina:
The question should be not what it looks like,but how it performs and how does she know what works and how it works? Could it be a presentation or a gesture? Could it be a skill or exceptional experience to where he or she is mature but still have enough energy to have an intense session every once in a while? Could it be a style,approach or a technique with respect to how you do your thing and how refined are you as your doing it? How sexy might look at 60 is one thing but how it acts,thinks and performs is another subject that is introspective and continues to stimulate your mind.

"The World's Fastest Indian".  It was really sex over 70, not 60, but it was portrayed in a very positive, warm way.  One of the few times I can ever remember seeing a sex scene between two people that age (though they were in bed together, the sex was only suggested).  

Two adults, passing through each other's lives for a moment in time, old enough to have no delusions or expectations other than to enjoy each other's company.  It was a refreshing change compared to the way older people are usually portrayed by Hollywood, particularly since they showed them as sexual beings.

And I do so fairly often, which is nice.

I will say this much about it:  The word "sparkle" comes to mind, a lot.