you gotta remember that vocaloid is at the end of the day, an instrument. there aren't really Canon ages. Technically miku has been 16 for like 19 years. She's typically DEPICTED as 16 but she's ageless because shes, well, not a person. yes you can call people making suggestive art of young miku weird and pedos, trust me as a Len fan I've seen plenty of sketchy stuff I've had to ignore, but miku has songs where shes older (as other vocaloids do) and this belief kinda borders on puritan beliefs that sexual=bad and evil degenerates. Miku has sex songs, len has sex songs. likeee they aren't children, their pictures and voice synthesizers. yea there is ways to be weird about it if you specifically depict them as children in art that is sexual, however claiming that they ARE children and that they CANT be sexualized is just fundamentally untrue and your letting yourself get conservative and policing people and drawing conclusions that aren't there.