Why would a 40 year old lie about being 55?

So, on Tinder at least, there’s something I read about people under 40 being sorted and matched differently than people over 40. The end result being folks in higher tiers of service getting access to younger matches. But because it’s a semi-known exploit, you end up with people lying about their age to manipulate the match set.

You also get a weird phenomenon such that you see the same list of people showing up over and over again on your feed, until you cross the dateline and suddenly they all vanish.