(brak przedimka) first important stage of life is childhood when we meet first friends,go to school and learn to read and write. In adolescence we fall in love for the first time and we 'have teenage rebel' (nie, daj to jakos inaczej..). Adulthood is (cos brak) time when we can start a family, get a job and get married.
People who have 'tens year' (nie rozumiem) have a lot of problems with health.
Old people have (albo przedimek, albo l. mnoga) problem with memory.
Some of them are lonely and depressed because their children 'don't' (zle slowa) interested in them or 'teir'(ortog) partners are dead.They don't have money to buy 'a' (niepotr) medicine because their pension is low. (daj przedimek) good thing in old age is a lot of free time. Sometimes grandmothers look after 'for' (niepotr slowo) their grandchildren.Senility is (brak przedimka) time when all memories are 'our heart of youth' (cos tu nie tak, to jest za bardzo po polsku).
To sum up I think THAT 'the' (niepotr) old age isn't a social problem.There is nothing (dodaj pare slow tutaj) other than thinking of (przedimek) good old days.
Za bardzo to jest po polsku, staraj sie nie uzywac translatorow.