That's a great point. If we all manage our own WoT metrics we all determine our own level of engagement with the broader network.
I hadn't thought of npub age as a WoT metric before, but it's actually brilliant.
I'd like to make it so I only see npubs that are less than 2 months old if they zap me or if someone I am following boosts or tags them.
Over time the requirements will get steeper. (1 year npub plus 400 followers and within 2 hops from my follow list)