I have a female guinea pig who has been with me for 7 years now. And I now know that guinea pigs require another one to maintain happiness. I honestly did not know about this when I first got her, I was only a child. But now that I'm older I realize my mistake and I feel horrible about it. She's a light-hearted lovable guinea pig who is a shy and a bit skittish and despite her being alone, she has only had a minor health issue once in her life. And I do spend a lot of time with her (even though lot's of people say spending time isn't the same as another pig). The question is, is it too late for a partner? She's really old, and I know how long guinea pigs live. Will she be able to tolerate a spunkier young pig? Or will she be stressed out? If we were to adopt another pig, I would want to adopt a shelter one, who is probably close to an adult. If anyone could help with this, please let me know.