Tired of watching your portfolio poke along and want to nudge it forward? The trick then, as many investment professionals know all too well, is to find ways boost returns here and there in the portfolio without taking on too much risk, while protecting against another epic downturn. Some advisors suggest older investors need to remain well-invested in stocks, if for no other reason than people are living longer and the old, conservative models may not produce enough money to last people deep into old age.