One thing I think is missing is a "From: a x year old" for each bit of advice. I think the advice to someone in their 20's would be quite different coming from someone in their 30's vs 70's, and that in itself could be very interesting.
One area where I think future advice can be most helpful is in preventing hard-to-reverse mistakes. 18F's data release for college completion rates, employment rates, etc in 2012 may have helped people avoid bad decisions[0]. Another example could be increased wariness of using a drug after hearing personal stories of people trying to quit. Using the recently shared visualization of related subreddits[1] and looking at the "/r/askdrugs" graph, one can see Kratom and quittingkratom, phenibut and quitting phenibut, benzodiazapines and quittingbenzos, opiates and quittingopiates.
Each piece of advice has a little person icon with a number next to it. That's the age of the person that gave that advice.