Puppies need a lot of time and attention that older dogs don't necessarily need. The vast majority of our older dogs are housebroken and able to stay alone all day. Puppies simply are not able to wait all day between potty breaks. Also, many of our dogs have basic obedience and some house manners. All of this needs to be taught to a puppy.
Seniors can be a wonderful mellow companion.
For a senior or someone with limited mobility, they can be the perfect pet. Also, if you are thinking about another dog, a sweet older Springer warming a corner of the couch could be a wonderful addition. Both males and females run the full range of temperaments. There are sweet retiring females and males. As well, there are upfront run all day males and females.