Weekdays of Lent:
 There is no obligation to fast. However, voluntary acts of self-denial are recommended.

Ash Wednesday and Good Friday:
 These are days of Fast and Abstinence from meat. There is a limit of one full meal on these days for all between the ages of 18 and 59 inclusive.

Days of Abstinence (All Fridays in Lent):
 All who have reached their 14th year are bound to abstain totally from meat.

Easter Duty Obligation:
 After they have received their First Holy Communion. Catholics are bound by the obligation of receiving Holy Communion at least once a year. This precept should be fulfilled during the Easter Season. Catholics are also bound to confess serious (mortal) sins at least once a year, but this is not limited to the Lenten/Easter Season.