A band director at a high school in Pennsylvania admitted to having sex with a 13-year-old boy he thought was 30, police said.

Dale Schimpf, 71, of Frackville, met the teen on Grindr and then sent him nude photos, telling him he was interested in a sexual relationship because the boy was “cute and younger,” WNEP reports.

Schimpf, who also teaches music at Nativity BVM High School in Pottsville, then met the teen for dinner Friday before returning to Schimpf’s home, where he forced him to perform oral sex before having intercourse, according to Tamaqua police. Investigators said Schimpf has admitted to the sex acts, but claims he thought the alleged victim was decades older.

The boy later told his mother about the alleged sex crimes, prompting her to contact police. Schimpf, who also teaches music at the school, was arrested on Monday, WNEP reports.

Schimpf has since been suspended from the school without pay, according to the station.

Some nearby residents, meanwhile, said they weren’t buying Schimpf’s purported excuse that he couldn’t tell the boy’s age.

“I don’t even know what to say about that because you can tell a 13-year-old from a 30-year-old,” Donna Bulino, of Saint Clair, told the station.

Another woman, Donna Hunter, of Pottsville, said she was glad “that these things come out” after being covered up for a “long, long, long time all over the world.”

“It hurts a lot of people’s lives as they grow older and into their adulthood,” she said. “It changes them.”

Schimpf, who is facing charges including statutory sexual assault by a person 11 years older than the victim and involuntary deviate sexual intercourse, is a well-known figure throughout music and church communities in Schuylkill and Northumberland counties, the Morning Call reports.

His involvement in those social circles dates back to 1968, when he began serving as the choir director and organist at Christ Lutheran Church in Schuylkill Haven. He began teaching at Nativity BVM in Pottsville in 2007, according to the newspaper.

Schimpf was taken into custody at the Schuylkill County Prison in lieu of $100,000 bail. He’s due back in court on March 12.

School officials notified parents of Schimpf’s arrest in a letter sent home on Monday.

“At this time, we no details on what led to the arrest, nor were we aware that it was going to take place,” read the letter, which was obtained by The Post. “According to Diocesan policy, Mr. Schimpf has been suspended from his investigation pending an investigation.”

Schimpf’s neighbors, meanwhile, told WFMZ that they regularly saw parents drop off their children at the band director’s home for music lessons. The teen he allegedly assaulted is not one of those juveniles, police said.

A message seeking comment from Grindr, including how the teen allegedly accessed the dating app platform despite being underage, was not immediately returned.