Aging times I've seen on my MusicStar
Baby to toddler = 1 hour
Toddler to teen = 24 hours
Teen to adult = 30 hours
Adults can mate after 2 days (once they are old enough to mate, the band manager acts as a matchmaker, visiting with a potential mate, twice a day for 4 days)
Adults turn in to oldies at about age 10
The band manager begins visiting with potential mates again, after they've been oldies for 2 days.
Buttons
The MusicStar sometimes ignores button presses. You'll get used to it. (This doesn't mean you'll like it.)
Good?
It's interesting. It does seem to have a rather steep learning curve, so don't expect to figure out how everything works within a few days of raising it.
Number of games
There are three built-in games you can play any time. There are also games to play when your character goes to school, or to the music studio, but you can play these only at certain growth stages.