IMO you want to distinguish between advice that is tactical and short term or strategic and long term.
The best tactical advice tends to from people who were recently in a very similar position as you, had had approximately the same goal you have, and either achieved the goal or failed. You want a sample of both successes and failures. The less recent, the less useful the advice.
The best strategic advice tends to be from people who have accomplished things you want to accomplish, regardless of time distance. Their tactical advice is less useful (because it is often dated), but the strategic advice tends to be better. You again need a large sample size to filter out noise.
The best tactical advice tends to from people who were recently in a very similar position as you, had had approximately the same goal you have, and either achieved the goal or failed. You want a sample of both successes and failures. The less recent, the less useful the advice.
The best strategic advice tends to be from people who have accomplished things you want to accomplish, regardless of time distance. Their tactical advice is less useful (because it is often dated), but the strategic advice tends to be better. You again need a large sample size to filter out noise.