The regulations on Lenten fast and abstinence are:
FASTING: on Ash Wednesday and Good Friday, those who are 18 but not yet 60 are allowed only one full meal. Two smaller meals are allowed as needed, but eating solid food between meals is not permitted.
ABSTINENCE FROM MEAT: Those who are 14 years of age or older are to abstain from meat on Ash Wednesday and all the Fridays of Lent.
The church no longer attempts to prescribe Lenten practices in detail. The above regulations simply highlight Ash Wednesday, Good Friday, and the other Fridays of Lent. The more fundamental obligation is to make Lent a penitential season, choosing practices that are adapted to one’s own circumstances.