person A: My son had his 4th birthday a couple of weeks ago.
person B: How did it go? What'd you get him for a gift?
person A: He got a remote control excavator_comma_ and had a lot of fun at his party.  It's crazy how fast he's growing up_comma_ though.
person B: It seems like all those years just flew by_comma_ huh. At least now he's getting old enough to start remembering all these great times!