I learned to take age and personal limitations into account. And personal desires.
e.g., I don't need to buy a super light high tech backpack, because I'm not going to be hiking anywhere very far. Used to be, 10 miles and a couple thousand feet elevation gain was an enjoyable day hike of a few hours. But recently I did 4-1/2 miles with maybe 600 feet elevation gain, no backpack, and I was really trudging along at the end. I couldn't wait for it to be over. I'm overweight and out of shape and did not find that day to be all that enjoyable (the first half - going downhill - was fairly nice though).
If I'm going to bug out - and I have no plans to do that - I'm realistically only going to be able to bug out as far as a motorized vehicle can take me.
I have also learned that with age, I need to consider how long I really want to live after the SHTF. I'm 67, so not young, but not exactly the crypt keeper either. Other than being overweight and out of shape, I don't have any significant medical conditions that might impede my survival. But still, over the last few years I have been evaluating how much money and effort I want to expend for survival in a desolate world. And yes, I consider a world without infrastructure, government, electricity, functioning society, clean water, etc. to be "desolate". Some may yearn to live in conditions like that, and in my younger days I was probably in that crowd too, but not any more. This recognition has probably had the greatest effect on my prepping. I don't bother to think "What am I going to need to survive for ten years?" I don't even think about five years from now. Or three years. I don't need to dedicate an entire room of my house to become a pantry of stored food. I don't need to buy three generators - one for use and two more for spare parts. I don't need to live on 20 acres so I can plant my own crops to eat. So my prepping has gotten much simpler just by realizing "I don't want to live that long in those conditions."
Everyone is going to have different ideas about how long they want to survive, but I think I have come up with a good idea of how long I'd want to survive - not how long somebody else tells me I should prep for, or how long they'd want to survive themselves. That's irrelevant for me, and I'm prepping for me, not for somebody else (other than my wife).
That's what I have learned.