If you haven't been able to identify the signs earlier It may be more of a challenge as the youngster may have started working. They have probably started to mange their own finances and in some cases will have have already become addicted to their digital devices.
Recognising the warning signs even at 18 might still help families and parents put in preventative measures before the potential lure of gambling sets in.
This is probably the most crucial stage as poor decisions made at 18+ can potentially have devastating life-changing implications. However, there are still a series of measures you can put in place but obviously the older the person is the more resistance you may find.
Once again this is by no means an exhaustive list but just some strategies that could ensure a potential situation does not escalate.