This was a lovely and poignant essay, one that especially hit me as we have a 13 year old boy, Silas. His senior status is something we can't ignore as much now that we, too, adopted a younger dog who is high-energy.
I, too, find myself relating to Silas and starting to think more about aging as I'm getting older, too. Ivy and Silas deserve to enjoy their senior years in comfort (and with only minimal annoyances from those young excitable siblings!).