A lawful permanent resident can not petition for a married son or daughter. Using Form I-130 you can petition for your unmarried sons through consular processing.
Regarding processing time, it depends on the availability of visas. Depends on the center where you file.
Yes for the over-21 unmarried son, no for the married one.
For over-21 children of permanent residents you can expect it to take about 8 years (longer if your son was born in Mexico or the Philippines). To keep the process alive, your son must remain unmarried during the entire process, unless you become a US citizen in which case he can marry after you get citizenship. The marriage would add a couple years to the wait time, but his spouse and children (if any) would be able to immigrate along with him.
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