I like him just the way he is, it never got on my nerves as I myself, even though I am a grown up have a 'little girl' voice. Some people are just like that, and I think he is fine . Muppet Babies and things..well I don't think they are pointless if no one ages now, as they were sort of flashbacks. If you did aging in the here and now though, I think it would be more than a little weird to have Robin age and no one else, as when you apply the law of age to one person you sort of have to say it is real for everyone else to... Anyway, I like him as his little self not becuase that's the only way he can be loved by a certain age but because that is Robin to me, he character is that wonder about growing up, that not wanting to be treated like he's little even when he is, that puppy dogness with his uncle, that is just him..and I love him for it. He is timeless, just fine the way he is, and not at all annoying (in the songs he sings or his character IMHO).