You've been driving mom crazy for 15 years, when she took you in as a foster to "get you adoptable". Her first foster failure (full disclosure - I'm a foster failure, too), you made agility all those years ago fun, frustrating and exciting every single run. I'm glad you did, because she still likes agility, and that means I get to play it too.
She's so thankful for that you are still going 100 miles an hour, even at 16. Your eyesight is diminished, and you can't hear her at all (like you ever listened to her anyway. We have that in common), but you still give 100% in everything you do, even if "everything" consists of running in and out the door to the yard to run around, begging for treats and sleeping in your bed (until you smell food - the nose still works perfectly).