my chart:
Reimu Hakurei - 11 (PC-98) 16 (Windows)
Marisa Kirisame - 10 (PC-98) 15 (Windows)
Mima - 20s
Genji - 150,but have more.
Shingyoku - the par looks in their 20s.The Ying-Yang orb looks old,200 or more.
YuugenMagan - no have age,in their 5 eye form...(but i imagined in gijinka form,looks like a imp-boy of 13 years. but have 500...young for a demon,anyways.)
Elis - 14
Kikuri - she have milleniums,but looks like a image of a 16 young girl.
Konngara - 24-26
Sariel - 24,always 24.even if are more old than the earth.
Rika - 14
Meira - 20
5 Magic Stones - no have age because is a creation of Rika...but,thinking in age of construccion...2 years? (in my imagination,are a group of 11 years old robots)
Flower Tank and that other tank - are more old,5 years for the two tanks.(two girls in their 20s,when imagined them humanizated)
Evil Eye Sigma - the more new creation, only have a year. ( in gijinka-tsukumogami form, looks like a 18 years old boy in my funny imagination.)
Ellen - 14
Kotohime - 21
Kana Anaberal - 14
Rikako Asakura - 17
Chiyuri Kitashirakawa - 15
Yumemi Okazaki - 18
Orange - 16
Kurumi - 13
Elly - 17
Yuka Kazami - 15 (PC-98) -20 (Windows)
Mugetsu - 15
Gengetsu - 16
Sara - 16
Luize - 25
Alice Margatroid - 12 (PC-98) -16 (Windows)
Yuki - 16
Mai - 16
Yumeko - 20
Shinki - 27
Rin Satsuki - 14
Rumia - 10
Daiyousei - 12
Cirno - 9-14
Hong Meiling - 20
Koakuma - 18
Patchouli Knowledge - 18
Sakuya Izayoi - 19
Remilia Scarlet - 12
Flandre Scarlet - 11
Letty Whiterock - 19
Chen - 13
Lily White - 14
Lunasa Prismriver - 18
Merlin Prismriver - 17
Lyrica Prismriver - 16
Youmu Konpaku - 11-14
Yuyuko Saigyouji - 17
Ran Yakumo - 23
Yukari Yakumo - 17-25 or the age who she wants.
Suika Ibuki - 13
Wriggle Nightbug - 14
Mystia Lorelei - 14
Keine Kamishirasawa - 26
Tewi Inaba - 14
Reisen Udongein Inaba - 18
Eirin Yagoroko - 26
Kaguya Houraisan - 21
Fujiwara no Mokou - 21
Aya Shameimaru - 19
Medicine Melancholy - 12
Komachi Onozuka - 21
Shikieiki Yamaxanadu - 23
Shizuha Aki - 14
Minoriko Aki - 16
Hina Kagiyama - 17
Nitori Kawashiro - 14
Sanae Kochiya - 17
Kanako Yasaka - 28
Suwako Moriya - 13-14
Iku Nagae - 20
Tenshi Hinanai - 19
Kisume - 9
Yamame Kurodani - 15
Parsee Mizuhashi - 17
Yuugi Hoshiguma - 23
Satori Komeiji - 17
Rin Kaenbyou - 16
Utsuho Reiuji - 16
Koishi Komeiji - 15
Nazrin - 15
Kogasa Tatara - 16
Ichirin Kumoi - 18
Unzan - old cloud man with 80 years...but have more for sure.
Captain Murasa Minamitu - 17-18
Syou Toramaru - 19
Byakuren Hiziri - 22
Nue Houjuu - 17,or a indeterminate age in really XD
PRIMEUS ummm...a adult fish,but anormally big. XD
Reisen II - 16
Watatsuki no Toyohime - 23
Watatsuki no Yorihime - 20
Haribel Han - 18
Renko Usami - 18
Sunny Milk - 13
Luna Child - 13
Star Sapphire - 13
Hieda no Akyu - 9-12
Rinnosuke Morichika - 23-25
Youki Konpaku - 40s
Tokiko - 14-16