I haven't seen demographic breakdown stats for Uchuu Kyoudai on 2chan yet. I could have missed them of course but as of now I don't think they were ever made available.
As for the manga being a seinen, it's surely worth mentioning but it's not that relevant in terms of demographic. A perfect example is Shin-chan which is a seinen massively popular among kids (much more than some other big shônen anime like Detective Conan or One Piece).
Quote:
世帯 個人.KID TEN M1 M2 M3 F1 F2 F3
*9.6 *4.9 11.9 *7.7 *4.0 *5.4 *2.0 *4.2 *5.8 *4.2 10/29 NTV 18:00-18:30 名探偵コナン
10.8 *5.1 11.5 *4.3 *8.8 *8.4 *1.8 *8.2 *6.3 *0.9 10/30 CX* 09:30-10:00 ワンピース
10.4 *6.9 30.0 *8.1 *3.6 *2.9 *2.9 *4.7 12.1 *3.2 10/28 EX* 19:30-19:54 クレヨンしんちゃん
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