Certainly getting them early, when possible, if a huge advantage. Certainly, as Brent points out, you won't be getting any teaching pros helping with this any time soon.
I've been fortunate enough to act as a mentor to a number of junior golfers and fortunate therein to pass on what was taught to me. The whole essence of it for me is about instilling two fundamental thoughts:
1) It is your responsibility to care about other people.
Just because you have the time to play slowly doesn't mean you should try to enforce that pace on anyone else. If you're holding anyone else up, don't get waylaid with considering whether you're fast or slow. Nobody actually thinks they're slow. And, regardless, it's all relative. Simply get out of the way when you're clearly not as quick as the group behind. If you happen to be the group behind and you're playing through, do so with as little fuss as possible. Hit and walk. Repeat.
2) Understand that you benefit from all of this.
Golfers on a golf course are part of their very own society. Just as we have common rules in society which allow us all to go about our business more efficiently, so it is on a golf course. If you learn to play with consideration, and everyone else does likewise, you're going to get round in the amount of time which suits you. That might mean that you call a few groups through or it might mean you get called through a few times. So long as nobody hogs the middle lane, everyone can progress as they please.
As I said, getting them young is a huge advantage. If you get them when they're older, forget about the first point. The only way you can get it across to adults is to explain the benefits to them. Clubs have to actively promote this and accept in the bargain that feathers may be ruffled. The plus side is, and I speak from experience, you tend to separate the wheat from the chaff in the process as the bargain bucket end of the market, the end which not only wants cheap green fees but also spends very little in the Pro Shop and bar, tends to complain and often moves elsewhere. The positive however is that your higher paying customers tend to warm to the idea, particularly when they realise that the tone of the club has improved a little. They bring their friends along and consider membership. Golfers are a snobby bunch.
I've heard this dismissed as wishful thinking. Clearly memories are short. What's more, there are any number of golf clubs left where exactly this approach still exists and still works extremely well. The proof is out there. The wheel does not need to be reinvented. It's in that little rule book which you pick a copy up of every few years and it's there because it works.