There is a saying that it takes two lifetimes to master fencing. Competition at this point should be viewed as a learning aid, not as a dedicated effort to win. Serious attempts at competing will be possible after 2-3 years, when the basic skills have been sufficiently mastered that the mind is free to consider strategy.
Progress can be faster or slower, depending on the fencer's aptitude, attitude, and dedication.
Rapid progress normally requires at least three practices per week, and regular competition against superior fencers. The average world champion is in his late 20s to early 30s and began fencing as a child.