Title asks the question.
Our old girl is 13 and has had 2 major operations removing cancers in the last 2 years which have probably bought her a couple more years. She is still active and agile for her age, has no joint problems, is well socialised, submissive to humans except unknown men/teens, well behaved and tolerates small children and puppies. Her only flaw is some ongoing aggression toward small dogs since my wife was bitten by an antisocial king charles cavalier (advice on this is also well received, and I am not having a go at the breed individual differences are huge).
In short she would be a good example to a pup looking to fit in with our way of life. I also like the idea that the pup would not be alone in early life probably helping it to have a more stable character.
My wife thinks we are better not to let her be hassled by a young pup is her last years.
Please voices of experience, share your wisdom