well obviously i know nothing about your situation.
but speaking more generally, i think sometimes older people expect too much of youngsters. a neighbour often skypes her children, wants to speak to her GDs, aged 8-9. perhaps because i am the onlooker it is obvious to me that the kids don't really want to be bothered. they are told to speak to granny, who then interrogates them, question after question. they are not interested and don't know what to say. they literally do not know where she is coming from. they are not unkind but it is beyond their ken.
i've tried to gently suggest the neighbour just lets them lead any conversation and not press them so much. but she doesn't see it; i fear she will alienate them. soon they will reach the stage where they simply refuse to be paraded.
re teens/ young adults, it is natural for youngsters to look forward, not backwards, and to be interested in establishing their own lives. they barely take any notice of their parents let alone GPs. their circles of significance are their peers.
older people have a completely different perspective; they are looking backwards, often living on or through their memories.
not that i'm saying there cannot be warm close mutually enjoyable relationships between different generations, but it can't be forced.