According to the Berkeley (the school, not the tackle company) site I have bookmarked, ages are as follows:
Black crappie: Sexual maturity 2-4 yrs.; Maximum life expectancy 8-10 years.
White crappie: Sexual maturity 2-3 yrs.; Maximum life expectancy 8 - 10, but few live past 4.
We don't see many black crappie, but I've cleaned some pretty small white crappie that held eggs, so the 2-3 years for sexual maturity sounds about right. - Roberta
"Anglers are born honest,
but they get over it." - Ed Zern