I'm old now (70+), so no more yahoo down hill for me. Or any off-road motorcycle. Can't afford to get off hard, may not walk away. So my MTB's have morphed into dirt and gravel ready cruisers more than adventure bikes. I still like suspension and a modestly plush saddle, and I need a rack for lunch/camera bag, etc.So my lightest trail cruiser is the K2 (alloy frame, carbon swing arm) at 30 lbs. It feels light to me, but not as light as when I bought it with serious weight weenie parts all over it. Adding the saddle, rack and road tough tires took its weight toll. Still a responsive ride
I'm guessing I'm prolly OK with MTB style bikes in the 26 to 32 lbs ranges. I don't have any pure road bikes anymore. Can't spend that amount of time bent over the bars ... Only have one steel bike left. A cromo Trek hybrid from years ago. Don't have a weight on it as it's hanging for winter storage.
What are you'all comfy with?