I think Mikey is around 38 - though he doesn't look it! In the first Take 40 Syndey video (which seems to have been taken off youtube) Mika talks about the band, where they are from, and how old they are, and what they play. He says Cherisse is 20 and Welsh/Ghanian, Mikey is 38 (?) and Korean and that Luke and Martin are Scottish and English (can't remember which way round?) and are in their twenties, I think.
I probably got alot of that wrong so feel free to correct me! I still can't find the video.