Geesh. I didn't even go to my 15 mainly because I didn't want to be seen.
My 20 is about four years off...yeah!
That's great that you're looking ahead. It isn't like you're crash dieting for your reunion in a couple months. You have plenty of time. And you slowly but steadily keep making progress, even if you aren't at goal, you're still be very proud. And you know, EVERYONE in your class is having the same reaction!