On our last flight, DH and I have global entry ( includes pre-check ), my girls are still 12. My MIL was on my reservation. DH was on a separate reservation. All 5 of us had pre-check on our boarding passes including my MIL who at the time didn't have pre-check. She had applied but couldn't get an appointment till after our flight.
I was so glad she had pre-check for both flights.