the guy was a numb nuts.

I had a similar incident about 4 weeks ago, I am doing like you crusing in my 53/14 nice pace and just enjoying the ride and not really pressing myself, alot of rolling little hills, I see a shadow a quick glance it is another cyclist coming behind me, so I slow a little because I don't like wheel suckers especially if I have never seen them or know them.
He stays on my wheel I slow a little more look back and he comes up on my right side, I say hey how ya doin, beautiful day isn't it, he has a nice ride a specialized carbon, young kid .

He looks at me and says see ya old man,, well holy crap boy was I taken for a surprise and he pulls ahead of me, took me totally by surprise and off-guard.
So Iam thinking to myself naw just leave it alone Gary, well it just really pissed me off. Old Man ah ok, he was a good 200-300-- yds in front of me now cresting the hill, so I sighed, put it in the big ring 53/12 and hammered,as I am coming on top of the hill he is looking down at his quads,{legs, must of been admiring them} still quite away in front I just kept the hammmer down, caught him and passed him with a hey toot, toot MOFO. , I look back he has no grin now, no smirk, I wave, slam the hammer down again and he never catches me.
I have to say that gave me a great chuckle the rest of the evening as well as the next day.
Us old guys, Ain't to old after all.