Before hitmaker Jason Aldean had his two children, Memphis (6) and Navy (5) with wife Brittany, he had daughters Keeley (21) and Kendyl (17) with ex-wife Jessica.

Life is flying by for the singer and his family. It’s something he’s well aware of, and in an Instagram post for daughter Kendyl’s birthday, he took the time to reflect on parenthood.

“As parents we spend all the young years runnin and gunnin, just trying to keep up and raise good humans,” the singer writes. “One day you wake up and they are almost grown and you realize you did pretty good at this dad thing.”

In the post, Aldean added photos of his teenage daughter as a little girl, along with photos of him and Brittany with Kendyl.

“I can’t believe it’s been 17 years since you came in the world,” he continues. “You have been such a joy for all of us watching you grow up and seeing what kind of person you are. I’m so proud of you and all you stand for. I love u so much and hope u have the best day.”

Stepmom Brittany also took to social media to shower their girl.

“Happy Birthday to the sweetest, most amazing bonus kiddo I could ask for,” she writes on her Instagram stories.

When it comes to the couple’s children Memphis and Navy, the two are jumping back into the new school season.

“How do I have a first-grader and a kindergartner,” Brittany writes. “Where did the time go?”