I was there at that YC startup school where Mark said younger people are smarter. The atmosphere in the air was part humor and part insight, not some seriousness to mean that older people are stupid in anyways.

The most important thing he said that day I can remember was that his company was, no matter what, a "software" company, and even his chief legal team lawyer codes as well, and stressed the importance of understanding and doing coding.

Now, I'm 32, and made a lot of money in my late 20's, and also in my early 20's, but lost everything right before I turned 30 in some legal grow op investments in California. I've never had a successful startup, even though I had a successful affiliate program in college, and am beginning to feel old.

When I was 22, in college and making more than a plastic surgeon because I figured out how to generate oodles of mortgage leads online during the mortgage bubble, I not only felt different, the world itself was different. Everybody seemed to be happier, friendlier. The world is just simply a different place when you're making lots of money and building things, whether its in internet marketing or in the startup world. The world is a very shitty place when you're stagnant, barely making any money, and just rotting away some like dead animal.

Its hard to even think straight any more. It's like a part of me is just not there that once was. I exercise and eat healthily, but its just not the same. Maybe I need to start getting on some HGH treatment, but that's nearly 30k a year. Its probably more mental than hormones.

So yeah, if you're over 30, you're a slow old man, only if you let it get to you deep down.