Is a wheelchair in my future?

I am 75 with a moderately controlled case of gMG. I can still walk around the house. I can go outside and go to small stores on a rolling walker. I can get around the grocery store pushing and leaning on a cart. I am curious to know how many of you are using a wheelchair on a daily basis, at what age you began and whether you think your infirmity is mostly GM related or a combination of GM and age. Thanks. I'm going to have to modify my house to use a wheelchair.