Hello;
I Guess when some one is 18 years old, he is mature to take his decisions alone. In Algeria Or the other Arab countries; parents usually interfere in their children's affairs. It doesn't a matter but it should not pass the limits because like this the child will find it difficult in the future to take decisions and will have a problem in self-confidence like this parents make their children feel that they can't be responsible and this is so bad. I guess that parent should not interfere only if they think that their children are in the wrong way.