Good tune. I really like the instrumentation - I wouldn't touch that.
I think the parts could be placed with a bit more definition - They seem a bit centered. That guitar answer to the vocal (fa-mi-re-do quarter notes, which also begin the song) might be panned a bit more to one side or the other to add interest.
For the vocal, I would really like to hear this tune done with a bit more "grit", maybe what an over-50 singer sounds like performing the last song of the night in a smokey bar :)
I would take a look at the change in EQ and volume that occurs at 1:55 thru about 2:15 ("Greatest stories..."). I think trying to keep it the same or closer to what has gone before might work out better.
I like vocal harmony, and so will suggest bringing some in on the phrases just before the hook line "Some kind of Adventure this is" (which I would keep solo).