The Covenant (2006)

The Sons of Ipswich are the descendants of five families who founded the town.  But one of the families is believed to have been killed off during the witch trials.  No one shall try to calculate the odds that 300 years later the four surviving families all have sons the same age who are seniors in high school.

Although they are the towns founding families, each family has a secret. All are descended from witches and the four boys are warlocks.  They receive their initial power at age thirteen.  When they turn eighteen, they will inherit all powers at their disposal.  But the power is addictive,  and if you use it frivolously and repeatedly, it will prematurely age you.

Caleb and Reid are currently in a power struggle. Reid is jealous because Caleb will be the first to turn 18. Plus he is interested in  the new girl in town  but she wants to date Caleb.

When a darkling appears, Caleb can tell someone is using the groups powers.  He suspects it's Reid since Reid is using his powers for stupid things like winning at pool and in fights.  But what if the fifth family really didn't die off and the descendant has come back to town?

This is basically Twilight with witches.