I don't have children that age, so bear with me if this list isn't very good. I have it in a file of ages and stages of responsibilities for children.
8 - 10 years
Complete responsibility for their rooms on a daily basis (bed making, dresser drawers, closet, vacuuming, etc.).
Unsupervised yard work (i.e., lawn mowing, edging, clean-up, gardening).
More complex meal preparations (pour and make tea, coffee, and instant drinks, using sharp instruments, baking, using appliances, beginning meal planning).
More difficult cleaning projects (scrubbing kitchen floor, windows, cleaning appliances).
Summer jobs (lawn mowing, dog sitting, babysitting, odd jobs for vacationers).
Financial planning (computing percentages for saving, tithing, offerings, gift-giving and assuming responsibility with parental oversight).
Beginning car maintenance (helping dad with minor repairs, learning tool usage, washing/waxing).
Help rearrange furniture. Help plan the layout.
Run own bathwater.
Help others with their work when asked.
Shop for and select own clothing and shoes with parent.
Change school clothes without being told.
Fold blankets.
Sew buttons and sew rips in seams.
Clean storage room.
Clean up animal "messes" in the yard and house.
Cut flowers and make a centerpiece.
Pick fruit off trees.
Build a campfire, get items ready to cook out (charcoal, hamburgers).
Paint fence or shelves.
Help write simple letters.
Write thank-you notes.
Help with defrosting and cleaning the refrigerator.
Feed the baby.
Polish silverware, copper, or brass items.
Clean patio furniture.
Wax living room furniture.
Change sheets and put dirty sheets in hamper.
Buy groceries using a list and comparative shopping.
Cross streets unassisted.
Keep own appointments.
Receive and answer own mail.
Wait on guests.
Plan own birthday.
Simple first aid.
Do neighborhood chores.
Sew, knit, or weave (even using a sewing machine).
Do chores without a reminder.
Learn banking and to be thrifty and trustworthy.
Handle sums of money up to $5.00.
Be alone at home for short periods.
Take the city bus to selected destinations.
Proper conduct when staying overnight with a friend. Pack own suitcase.
Responsible for personal hobby.
Handle self properly when in public places alone or with peers.
11 - 12 years
Join outside organizations, do assignments, and attend. Able to take responsibility as a leader.
Put siblings to bed and dress them.
Clean pool and pool area.
Respect others' property.
Run own errands.
Mow lawn with supervision.
Help Father build things and do family errands.
Schedule himself time for studies.
Buy own sweets or treats.
Responsible for a paper route.
Check and add oil to car under supervision.
and another list:
http://www.youthonline.ca/parents/chores/chorelist.shtml