What does he wanna do?
Basically, just find something that's gonna produce long-term results and ride it out.
When you think of retirement investing (401(k) IRA, etc.) I want you to think of one thing and only one thing...
time.
Time is the secret ingredient that makes all this work. Time is the catalyst for compound interest, and compound interest is how you're going to end up rich.
The more time you have to make that money grow, the better off you're gonna be. It's that simple. That's why the younger you start, the better off you'll be; because you have more time.
The reason penny stocks would be bad here is because they're incredibly volatile. Even if you did see a legendary 30% increase in a week, there's very little chance that stock would continue to appreciate at any meaningful pace over the next 30 years.
I'd put money into something boring like SPY, maybe some Procter and Gamble for dividends, any number of index funds, etc and just let it ride.