That all depends on what makes a guy a decent guy.

Are you mature enough to be attracted to a good guy? If you take that question as an insult, then probably not yet (you'll get there), and if you took that question as a legit question, then you probably are.

I tell people I'm 65, and they're amazed at how young I look.

The problem with this question is that all the geniuses we can think of rely or relied on thinking that was done before them. Whoever you think is the worlds biggest genius wouldn't have been able to do any of the things they did if others hadn't already contributed what they did. And, alot of the contributions they rely on were from people that "weren't geniuses".
There's also the fact that so many of the geniuses out there have never been recognized, and/or they've been suppressed. We only think of the people that've been recognized, and their names have been spread. Alot of "geniuses" are just people taking the credit for what others do. Edison, for instance, almost always credited others for the genius they did, but the press and our schools only push the name Edison.