trojan condoms

Me and my boyfriend had been usuing these condoms for five years and about a year ago they started breaking everytime nothing changed not the way we had sex place nothing i think the quality of the condoms have been deterating. he is now 23 so its not like hes getting any bigger if you know what i mean i just think if were paying over a dollar that they should work. We thought it was because we got itform cvs but we started to pick it up at other stores and they stillcontinued to break we already have one small child we dont need any other i think too many young people are having children already could it be because the condom company wants you to use five or six at a time so that you have to buy more id liek some answers to these questions......