Suppose you are an adult (according to Allah) like 16-18, but a child according to society and your family, and you want to get married for Islamic reasons (keeping away from zinnah [adultery]) and both the man and woman agree. I know you should get the permission of the parents but they are ignorant on these matters as they have been strongly swayed by today's customs (may Allah guide us all) and believe one must get a degree and buy a house then by age 28 go get married, and before then suppress our sexual desires or even secretly relieve them. It is genuinely just a "hassle and stress" to ask permission, so...
Would it be OK if they got married for the sake of Allah then a year or so later tell their parents?
Also I know how important it is to provide for your wife, but like I said in such a society getting a job and house by age 16 is very difficult, so can you be married lawfully but remain in parents' house then when you can support her (which you should try asap) then tell parents?