Hi Momma,
Wow , you seem to be one of those special friends. Welcome to the site.
The truth about life expectancy is : Its only an average . No one really knows.
Its all about positive attitude , maintaining your weight and your energy levels.
I believe as others that you need to be pro-active in determining your needs. ie: Peg , mobility devices (walkers/chairs) and communicating.
Look into the nearest
ALS Clinic/Rehab Center . Also , look into what services are available that can help your friend. Its never too early to get signed up for these services.
Glen