Do I still need to pay CSA when my son turns 18?

October 18, 2015

Im paying £354 a boy is 17.and my girl is boy has recently started college,do I still have too pay when he turns 18?.as he is at college? what would stop him staying at college till hes forty its a crazy rule if its true.i take home after csa roughly £900 a month, i pay £300 rent.£20 electric.£20 phone.£25 internet.£45 bike insurance.i try too keep my food down too £20 a week.i also have petrol too pay £20 a clothes which I rarely you think I pay too much £354 a month?.please help.thankls.