I have never been able to tie my shoes while standing up. Sitting down to do it wasn't any easier (there are certain disadvantages to being tall). that's why I invented a structure I named a "foot stool" (patent pending). It allows me to comfortably reach my feet so I can spend 5 minutes tying the 50' laces on each shoe. (long shoelaces and cats is a sure combination for a fall.)
I can lean over and put my palms flat on the floor with my feet together. So yes, I can lean over and tie my shoes........but I only wear flip flops these days.
I can bend, but not double. Going down on one knee still requires bending forward but not to the same degree. I can't bend backwards, at all - I used to be quite good at limbo, could even do it on ice skates. Not anymore.