Of course you can be 30 and give advice. Is there a rule where you have to be a certain age to give advice?
Even if you're 10 years old, you are allowed to write on the Internet and no need to police yourself with arbitrarily "waiting".
Also an argument extrapolated on your own experience of 37 that nothing is figured out is not very good argument against when you can or cannot say something.
I’d agree with that. A quick skim says there’s nothing in that list I haven’t heard elsewhere. That doesn’t invalidate TFA, it is advertised as “collected bits”. But most does not appear to be original with the author.
This sounds more like advice that he's gathered or been given that seemed the best to him. I think that's fair. People give young people advice a lot. Also becoming a dad makes one feel quite a bit older. Now it would be interesting to see him reflect back on these in 30 years...
Turning down advice on the principal that someone is "only 30" is going to leave you missing out on lots of good advice as well. People, regardless of age, may have insights that you lack. Throwing it out wholesale is as foolish as blindly accepting it.
I feel many people are more interesting in their 30s when they are still full of dreams and idealism than in their 50s after two marriages, a mortgage and a lot of hairloss.
The dreams and idealism loses its luster after you've seen it play out enough times. The people in 50s should, on the other hand, have more mature and nuanced perspectives.
Even if you're 10 years old, you are allowed to write on the Internet and no need to police yourself with arbitrarily "waiting".
Also an argument extrapolated on your own experience of 37 that nothing is figured out is not very good argument against when you can or cannot say something.