I'm a novice backpacker, but, at age 62, I certainly want to carry as little as possible. For me, one of the problems is the tendency to want to "buy what I need" to get lighter. But that's not the answer - you cannot buy MORE and end up with LESS. Sure, you can trade one piece of gear for another to save weight - but mostly I need to GET RID of stuff. And you cannot buy that.
Also, I agree with person who said "what if" is the enemy of ultralight. In my career, my job to be prepared for problems - for things to go wrong. It's hard to break that habit!
I want gear that will make me comfortable - to be able to sleep well, for example - but I know I'll never get a chance to use it more than 10 miles from the trail head, if I have to carry too much weight.