If I may add my two cents:
IYNO has always been a youth community for naturists as much as it has been a naturist community for young people. That is the whole reason we have the dorm, an area for sex talk was pretty much inspired by the advice columns found in some youth magazines. Definitely not a typical feature for a naturist community, but one that is quite common in a youth community.
We have been fairly tolerant of members outside our target age range in the past. Particularly long-standing members were welcome to stay, to sort of not let the family drift apart. But I also feel a lot of that was due to denial that life goes on, that doors always close and others open, that familiar people move away and new friends appear in our lives. Some people left setting signs - like Stuart and Karla deciding to end their membership here and found Free Range Naturism, or Pisco transferring ownership of the site to Wesley. Others just faded away - including Danee, who was at times the biggest advocate for keeping the family together, has been away from this community for the past four years. Things change, and we need to face that, or we will not remain a youth community for long.
For advice on how not to do it, just look at any established physical naturist club. Often, lots of their members will be people who were young in the summer of '69 or something along those lines, and who embraced social nudity back then. And now, look at the clubs that always stuck to their own. Sex, Drugs and Rock'n'Roll has long made way for marriage, heart medication and 60s hits. This is not the future we envision for this community.
Luckily, we have had a steady influx of members all across our target age range, and it really makes me happy that it is often the younger and mid-range members that are driving a lot of the activity here. So yes, cutting off some of the older members might cost us some activity in the short term, but we will still have plenty of community left, and I do expect that by making sure this place stays welcoming for the young adults of tomorrow, keeping our eyes on the future, rather than the past, will be a net benefit in the long run.