In Part 1 of our virtual worlds series, we look at how games have already become popular social platforms

Video games are only getting more popular.

Roughly 2.5 billion people around the world played games last year, double the number of players in 2013. Gaming is a $149 billion industry, growing 7% year over year, with the U.S. as its largest market. In America, the average gamer is 33 years old and 46% of gamers are female, according to the Entertainment Software Association.

(This is part one of a seven-part series about virtual worlds.)

Per Quartz reporter Dan Kopf’s summary of U.S. Department of Labor data:

More people now report playing games on a typical day — 11.4% in 2017 compared to 7.8% in 2003 — and, on days they do play games, they spend more time doing so — about 145 minutes in 2017, compared to 125 in 2003.

Young people are the biggest driver of the trend. From 2003 to 2015, 15-24 year olds spent less than 25 minutes playing games on the average day. From 2015 to 2017, those in that age group dedicated almost 40 minutes a day to games.

Mobile games account for a large part of this dramatic growth, but all major game categories are growing. The console gaming market — the oldest segment and most expensive due to hardware cost — expanded more than 7% last year alone.