Cindy's Answer
This is a hard question to answer with any certainty because all dogs are different and the dynamic between 3 dogs is more complicated than 2.
Since your oldest dog is male, I might suggest another male since it's likely at some point you'll be back down to 2 dogs and as a general rule a male/female pair often get along better long term. As far as age, I like to add young dogs to my existing group so I can raise them with my dogs from puppyhood, it may be a bit more work at first but I can manage all their interactions and I know my puppy is a clean slate, so to speak. If it's an older dog it may have had some experiences you aren't aware of that can create some problems.
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