[adpirz]

Anecdata re: readership age: https://news.ycombinator.com/item?id=17636856

Eyeballing: average age seems to be mid 30's.

EDIT: 35.4, you can run in your console on that thread:

    function averageAge(){
        const ages = Array.prototype.slice.call(document.querySelectorAll('.commtext'))
                    .map(span => span.innerText)
                    .map(text => text.slice(0,2))
                    .map(firstTwo => Number(firstTwo))
                    .filter(n => !isNaN(n))
        return ages.reduce((x,y) => x + y, 0) / ages.length
    }

    averageAge()

[faitswulff]

Played a bit of code golf with your snippet, but can't figure out how to combine the .map(Number).filter(Number):

    let avgAge = [...document.querySelectorAll('.commtext')]
                  .map(span => parseInt(span.innerText))
                  .map(Number)
                  .filter(Number)
                  .reduce((i,d,c, ages) => ages.reduce((x, y) => x+y) / ages.length)