Board Thread:Legitimate Canon Questions/@comment-25176701-20160611021923/@comment-4723271-20160615191359

Young Peter Hale: "Laura told you about the packs being here right? There are more Alphas than I've ever seen in one place. Your mother would never do it, and these packs won't be here much longer. The time to do it is now. One little bite, and she never gets sick again, she stays younger, more beautiful, think how she'll be able to protect herself. Derek, the bite is a gift."

This is perhaps the biggest clue towards werewolf aging. I feel like a dumbass bc I forgot about it. Peter says it, Paige becoming a werewolf would allow her to stay younger.