as mentioned above, it is extremely common in the US for indergraduates in college to take more than 4 years after their graduation from high school to finish college. In the 1960's, I recall that perhaps 25% of each class at Harvard took a year or more off before graduating. I did so myself, and my three roommates took 1, 1 and 2 years off. This had essentially no effect on their future careers. Moreover it is common for students to spend an extra year after high school in preparing for college, especially athletes and others desiring to gain entrance to an elite school and hoping to improve the chance of acceptance by taking an extra year of preparation at a "Prep" school. This was suggested as an option to my son who hoped to gain acceptance to an elite college and play basketball there. It is an advantage for a college athete to be older since a 25 year old makes a more mature athlete than an 18 year old. Indeed one classmate of mine, Christian O'Hiri, regarded as the greatest soccer player ever to play at Harvard, entered as a freshman at the age of 22, after already playing on an Olympic soccer team. It was seldom even mentioned, as he dominated ivy league soccer, that he was 4 years older than the competing players. I myself graduated college the year I turned 23, and my two sons turned 23 and 24 in their graduation years. None of these age differences affected any of us to my knowledge. I also delayed obtaining my PhD, receiving it at the age of 35, rather than say 25 or 30. This played no role in my competition for a place in graduate school or for a tenure track job. It did however play a role in determining the number of years during which I was able to accumulate retirement credit after being hired. I.e. people usually retire in the US between 65 and 70, so a person who starts work at 25 or 30 thus has more credit toward retirement than one who starts at 35 or later. (Technically professors with tenure do not have to retire at a given age, but univertsities can do things to encourage them to do so, such as make the retirement salary calculation go down for older workers, or increase the burden of their teaching load.) But basically I think we are saying you do not have to worry about how starting uni say at 20 will affect your future. I.e. for a young person, a time variation of even 4 or 5 years probably makes very little difference.