it depends on with whom we are talking... but mostly we talks frankly and freely with our own age people. and we talks with some respect and care with older then us... but if some old people are our friend from long then we also behaves with them as our own age people,.. but talking way also depends on people to people.. like some old people dosent like to be frank with younger.. and some enjoys the frankness with younger....so its up to you how you recognize their nature .....

you can talk like when you talk with friend and you can talk with respect.

I suppose you mean how one does it in English. There is a big difference in Korean and Japanese using different verb endings and noun suffixes but there is nothing like this in English. Probably the biggest difference in English is to use Sir, madam, miss and avoid using curse words or asking too many personal questions when addressing older people. John