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.
 https://www.youtube.com/watch?v=sycgL3Qg_Ak 4m40s
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. 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 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.