There's a general misconception out in the homeschool world that Five In A Row (FIAR) is just a kindergarten curriculum. That's pretty sad to me because I know from experience that it can make a wonderful multi-age (multi-grade) experience....it just takes some tweeking. One room schoolhouses did this type of thing all the time and since you are probably homeschooling more than one child, you can glean from the one room schoolhouse experience.
One of the struggles with homeschooling is having a curriculum for everyone. Now there are people who can keep things together for a while with everyone in different levels but as someone who has homeschooled a long time I can assure you at some point you will burn out running from one kid to another. Yes, you will have to keep the 3R's at each individual level but you can learn the other things together just at different levels. You can also have the older students help with the younger students and I can tell you that something amazing happens when children teach a younger sibling. Older siblings can "teach" in a way that younger students really understand! Don't underestimate what a 7 yo can do! ;)
If you would like to see how that might work in action just read the book Understood Betsy, and you will get great insight into how multi-level teaching aka one-room schoolhouses worked. Now how do you actually use FIAR for older kids? Here's some great wisdom from Melissa Crabtree, at Five In A Row, who wrote about this very topic:
If you're curious how we tweek it just go to the FIAR tab at the top and most of the books have "beefing it up" options.
Peace I leave with you; my peace I give you. I do not give to you as the world gives. Do not let your hearts be troubled and do not be afraid.