I'd like to rephrase the "someone is always stronger/faster" into "we all have our limitations". Identify YOUR limitations and make decisions and preparations so that those limitations doesn't kill you.

The way I see it, the difference between myself (fairly OK fit, fairly OK skill set - but no superman) and the elderly lady who can barely walk on flat pavement is more about degrees, not absolutes. Both she and I have very real physical limits. I might walk 30 miles farther than her before I freeze to death, but I'll still be just as dead if I don't respect my limitations.

The old lady and I share the need to do what-if thinking and preparations - but the specific answers will be different. Different circumstances dictates what options you have avaiable (or what options you CAN MAKE available through preparations).

I might have the "bug out in the woods for 3 days" option with my skill set, fitness level and a little preparation (gear and plans). She doesn't - so she need to place more weight into other options. Such as bugging out to a neighbour.

Another similarity is that both she and I will enjoy HUGE benefits if we do physical training on a regular basis. She might be too old to run, but she WILL be able to maintain and expand her current physical capacity - and in doing so she will enjoy so many health benefits that I won't list them here.