I'm out of the loop now , but in the UK I think the situation is pretty similar. Most younger ones are just leaving as soon as they hit 16.
Just last week quite by chance I bumped into a guy who I remembered as a kid in our neighbouring congregation - the type that always gave great bible readings at 10 years old. I used him once for a demo at a circuit assembly - the "youngster witnessing to a schoolteacher" type of demo.
I asked him if he still went to the meetings - he's now 19 & told me he stopped going though occasionally he goes to the Memorial or weddings / funerals. He had realised it was just not for him a few years ago. He's now at university , has a nice girlfriend - living a cool life. His parents aren't too happy but they have come to terms with it. His father managed to hang onto his elder status. He still hangs around with quite a few of his old pals from the KH- some still attend , most don't.
Even the younger ones who stay in are often just nominal JWs. They have learned to play the JW double life system. I've a few teenage / early 20 relatives who are baptised but essentially lead lives that aren't much different to their "worldly" peers. It's all about social networking , playing XBOX / PS4 games , hanging out in pubs.
I also saw a picture of a KM school recently. Almost completely older guys - average age had to be 60+. Long term , the future looks pretty dire - in Europe at least , unless the belated and somewhat hamfisted attempts by the WTBTS to keep in the youngsters has some tangible effect.