Large familys!!

I'm a 36 year old mommy of 7 kids, ages 18,17,15,12,8,7 and 7 months.All my kids are from one dad my husband been together for 19 years.We both work and fully support our kids financially.We have been thinking about having one last baby so our youngest baby can have someone close in age, since there's a big age difference with our other kids.Im really having second thoughts since I just turn 36 yrs.Would I be to old for one more?