This can be a really good idea for owners living in restricted spaces. A female who has had kittens and been turned in to a shelter (sad and common fact that this is the only ‘mistake’ she has to make), often waits for many months to find a willing adoptive family.  They are very grateful and often revert back to kittenish now the responsibility of raising kittens is removed.  Older males who followed their hormones and get taken to shelters for rehoming are usually excellent pets.  And if you really just want a feline friend to lounge around with – consider an older cat – even 8 – 10 year old cats have a lot of living to do since the average age of an indoor cat is now 16 years old! Check out the Feline Age Graph – https://icatcare.org/advice/how-to-tell-your-cats-age-in-human-years/