As these high growth early stage companies start to list on the public markets and become mature businesses, a new layer of the startup ecosystem around which other startups can be nurtured and launched will be created.

FORBES: Why 2013 Will Be a Big Year for NYC's Tech Startups!

Energy industry experts predict the EU will import 90 percent of its oil and 80 percent of its natural gas within 20 years as onshore and offshore fields become mature.

CENTERFORSECURITYPOLICY: Energy Squeeze

There's four of us, and we all go off and we have our little journey, and we mature, and we change and become better people.

CNN: 'Detroit Rock City': KISS mania

In the span of just seven years, social media has become a mature platform and calling the times in which we live a conversational era seems a bit obvious.

FORBES: Age of Context: Draft Introduction

Female sturgeon don't become sexually mature until their 20s and spawn about every four years, so the spawning season, in which they surface from the depths to lay their eggs on rocky shores, is an extremely important time for the species.

WSJ: Standing Guard for the Sturgeon

As those methods mature , they become less costly (and, eventually, rather conventional), increasing supply and putting downward pressure on oil prices over time.

FORBES: America's (Un)Peak Oil

The authors of this study say as children mature, they require less care and stress for parents -- and can become a source of support for moms and dads.

CNN: Does having children make you happy?

As women mature from 20 to around 50 years old, things change and the guidelines become more like a favorite family recipe: A little of this, a little of that.

CNN: Want strong bones? Start early