By the time the high school kid pays his FICA, state & federal taxes, health insurance, 401K contribution, etc... he will be in about the same situation as his grandfather on Social Security.
Of course, the kid may be living in Gramp's basement.
I think of "a big jump" and Social Security as being mutually exclusive. Social security payments are based on "the cost of living for an urban clerical worker". Food and energy are excluded.
I'm just waiting....waiting for Medicare to announce how much of an increase we'll be hit with. I'm wouldn't be surprised if it's at least half of that 6.1 - 6.2% increase.