system
sentimental: My son recently turned 4.  It's hard to watch him grow up so quickly.
gpt
My son had his 4th birthday a couple of weeks ago.
human
How did it go? What'd you get him for a gift?
gpt
He got a remote control excavator, and had a lot of fun at his party.  It's crazy how fast he's growing up, though.
human
It seems like all those years just flew by, huh. At least now he's getting old enough to start remembering all these great times!