Adopting a senior dog in my opinion is a very noble act.
I think it reveals things about your character.
First, I can tell you're not easily taken in by outward appearances. You know not all that glitters is gold, and that not all gold glitters.
You're probably not entirely selfish, and we could most likely be friends.
You might be one of the true animal lovers and probably don't understand it when people stop at the roadside puppy stands and then months later, lose interest in their purchase.