Your IQ changes gradually as you age, gaining stability over a score from a younger period of life. IQ test scores show higher volatility at younger ages but even though stability is found over time, most people’s test scores stay approximately the same. Both crystallized intelligence and fluid intelligence can potentially be improved through conscious decision making, amassed knowledge and education, but it is whether that knowledge is applied to your daily thought processes that normally puts a stable buffer on your IQ score. Nonetheless, studies show that there are ways to increase your IQ, from cardiovascular training to mental exercises, regular puzzle games, and even journaling, there are many possible methods which are backed by hard science.