I’m really glad the Church has made this decision. When I turned 18, I had an easy transition into elders quorum because I shared a kind of priesthood camaraderie that transcended age gaps. I could see that some of the young women my age had a tougher time transitioning into relief society. At 18, they still felt like young women, and it was hard for them to bond with the older women. A shared meeting like this might help in that regard.