I agree with part of what Matt says and I disagree with some of it to.
Yes people do have kids and get mini vans and need to make some life changes. I started racing and getting in to cars in 1994. I was 19 and my 1st son was born in 95. That didnt stop me from following my dream, passion or whatever. I was away from home a lot but I ALWAYS took care of my kid. I was fortunate enough to get thrown right in the mix with lots of fast cars right off the bat. For a good 10-12 years I spent almost every night in the shop, street racing and at the track. We traveled all across the country racing, IHRA Top Sportsman and IHRA Pro Stock. That was my life for a very long time. I got to a point where I was just tired of being away so much and decided to take some time away. I never was completely out of racing but I took a big step back for a good 8 years or so. In the last 5 or 6 years since I have been back in to it, more and more every year, I see a lot of new faces but most of the old crew is still around. They may not come out as much but they still do. I dont know to many people who are as busy as me. I have 5 kids, a wife, 3 cars a mortgage and much much more and I still find time to follow my passion. Its not about Mature, immature, whos better than who, whos grown up ect ect. Its about the passion for cars and racing. No matter what you do in life it stays with you. That fire does not die. If you can say some of the BS that comes out of Hal's mouth then your nothing more than a poser in my book and you never had the fire burning. You can be mature and successful and still have a good time doing what you love.