How to check if a page is older than say 30 days?

Question

I know it's possible check if a post is a specific age, but I would like to do the same with a page in WordPress, to see if the page is older than 30 days, then trigger code...

if ( page_age(30) ) {
// Archive the page, hide it from visitors
} else {
// Keep it listed and available to visitors
}

Answer 1

save time when page is published.
then subtract it with current time...

var days = new Date(older-current);
var daysOld = days.getDay();

if(dayOld>30) return true;//30 days complete
else return false;

Answer 2

if you want for some reason sql command since you tagged sql
select * from poststable where postdate<'year-mm-dd';

where posttable is table where posts are kept and postdate is column with post date :)