They're all grown up! While their older siblings are getting married and having babies, Jedidiah, Jeremiah, and Jason Duggar have been putting their free time to good use. Jim Bob and Michelle's boys — ages 19 and 18 respectively — recently took part in prison ministry, partnering with the staff from Journey to the Heart.

According to a Duggar Family Blog post from June 7, Journey to the Heart is a "spiritual retreat, initially created for young people but now available for older adults, in which many of the Duggar kids have participated. The goal is to focus, for several days, on the Lord and to discover his Love in a deeper way."

Several people commented on their post, with many agreeing they've all grown up so fast. "Thanks so much for posting about these young adult men," one person wrote. "So nice to get an update on something that they are doing. The Duggar kids are getting so grown up!" Another certainly knows their Duggar knowledge — and a bit of math. "It's hard to believe how old these guys are getting! If the twins are on the same path as their oldest brother, then they will be getting married in about a year from now. Josh was 20 1/2 when he got married, and they will be 20 1/2 next June!"

Earlier this afternoon, Josh made headlines for making an incest joke involving his sister and brother Jana and John-David. During a resurfaced 19 Kids and Counting clip — which was filmed years before it was revealed Josh sexually abused four of his sisters — he explained how he was going on a "double date" with his twin siblings and then laughed, "We are from Arkansas!" BRB, cringing.

Luckily, it seems like Josh's brothers are a far cry from their disgraced brother.

Love the Duggars? Be sure to join our Duggars Facebook group to chat about all the latest updates and juicy gossip!