You must become a US citizen in order to petition for your parents. It will take three years from becoming a permenent resident before you can apply for citizenship if you stay married.
I understand from your question you do not have legal status in the US. First you have to become a lawful permanent resident, then you need to obtain your citizenship. Once you become a citizen, then you can sponsor your parents for their permanent residency.
This is not legal advice and a client attorney relationship is not created. For a free consultation call (718)234-5588.
There are different requirements as to who can petition for alien parents. Once you are married, your age is not the relevant factor. In order to petition for your alien parents after marriage you will need to, as my colleagues have already mentioned, be a United States Citizen. If you do not already have a Legal Permanent Residence card ("Green Card"), you will need to obtain one through your spouse, and then maintain it for 5 years before you are eligible to apply for United States Citizenship.
Please remember this is not official legal advice, and this is no way establishes an attorney-client relationship. For a free 15 minute phone consultation please call 972-638-7207.