I'm sorry for your loss. I had 2 cats for 17 yrs and had to bury them both in last 2 years, too...due to their old age. Other than them having accidents with cars (you can't teach them to drive), they were healthy until the end.
Now it's 1.5 yrs later and I have a 3 yr old rescue white border collie. Pets are special souls and when you live alone, they make the difference.