There are some really aggressive insurance companies that will offer great rates on life insurance for type 1 diabetes even if diagnosed at young age.
Your age when you were initially diagnosed and how long you’ve had the diabetes are important factors in determining best rates for you.
How well your diabetes has been controlled, any past or present diabetic complications (i.e. neuropathy, retinopathy, kidney problems, etc.) and your overall health otherwise are also important factors in determining best rates for you