Older people today are not treated with respect because they are regardedto be barriers to social progress for many young people
as far as i know, regarded to be is an incorrect idiom, you should use 'regarded as'
so that young people may face barriers to top-level promotion and feel demotivated.
This meansthat young people have to spend more time taking care of older relations (do you mean relatives ?), which will influence the daily life of the young ,and that is the reason why many senior citizens have been sent to the nursing house
and thus. Thus, children's good attitude and kindness to the elder could be influenced negatively by their parents under this atmosphere
you should say: the attitude of children could be...
paragraph 3 should be combined with the 2nd as it talks about reason, too.
anw, your vocabulary is good, maybe your speaking are so good that it influences your writing
P/s: you should shorten some sentences above