What you see is what you get!
They are adaptable and can settle-in quickly.
Training can be easier.
Less messes, usually.
Adopted older pets are grateful for you.
Somehow, older pets seem to know you gave them a home when no one else would. Many new owners form a close bond very quickly with their senior dog or cat, because the pet shows them a level of attention and devotion that is unique to older adopted pets.
Do you have a pet? Did you adopt or buy from a breeder?