Do you have to put a number? Would something like '???' or 'unknown' suffice or are those restricted as well?
Yeah. I tried that. It said that it had to be alphanumeric, yet one UTAU's age is listed as unknown and it passed.
Hmm... Perhaps try typing in the age they appear as instead? I've never submitted a showcase item so I don't know if that part can be left as blank
