Do you remember every single second of the past 10 years? Me neither. If your brain wanted to, it could skip around and fill in fuzzy memories so you only really experienced the last 10 minutes but remembered (fuzzily enough) 30 years before that point.
Well Cobb stated that when he and his wife woke up from their limbo, he stated that they woke up young again, like they lived an entire life. That's what I'm referring to because that's not thinking you did something but an experience.