How much faster (and for how long) would you have to move to gain a year of lifetime compared to the average person on earth?

I apologize in advance if this is a foolish question or if my terminology is incorrect (I'm not a physics major or a student in a physics related field).

I have heard that the faster you move the slower time moves for you compared to others who are moving at slower speeds. This effect is very small and minuscule for pilots and Nascar drivers because they do not that much proportionately faster than the average person. So, given this fact, I was wondering at what speeds you'd have to reach and for what duration you'd have to have these speeds to see a significant impact in aging slower as compared to a normal individual on earth. Also are there any other variables at play besides speed and duration?

If this is calculable, I'd be curious to know how fast and for what duration you'd have to move to gain a year of lifespan as compared to someone aging normally on earth.