It really depends on you as a person to be honest. Usually, when you stop growing.( Usually 16 for girls or 18 for boys) is when your feet will stop growing. If you find yourself growing past that age you can probably expect your feet to grow past that age. Also is is genetic. Find out when your folks feet stopped growing. That will probably reflect on you.
Different parts of the body grow at different rates for example some people continue to grow in height till the age of 24 while for most it stops by the age of 18 to 21. The growth rate differs with respect to gender, race, climate, diet, heredity and a host of other factors.
Growth in some way or the other continues in the human body until we are alive for example though bones stop growing by the age of 25 in most places cartilage continues to grow well until old age; hence we see people with large noses and ears in old age.
The feet continue to grow for a number of years after adolescence though in small measure. There are several other factors like people who walk a lot wearing well fitting shoes tend to have smaller feet than people who walk barefoot. Also feet size increases with increase in weight; hence the shoes that fit when you are 20 don't fit when you are 40.
The age range that marks the surcease in growth is usually from 15-25 years. This happens when the bones stop growing. Layers of living tissue compose the structure of bone. These tissues, in turn, are made up of cells that secrete a calcium-rich material, which is as hard as marble around themselves. The process of ossification or bone formation is a complex one that originates in the cartilage (the elastic material which serves as a cushion between bone joints). In the body of a child, the bone formation starts in the middle of the cartilage. Gradually the bone grows from both ends until the cartilage has fully transformed to a full-fledged bone with an exception of the tips (the cushions between the bone joints as mentioned previously). When the growing period stops, these tips of the bone close, thus joining the main shaft of the bone.
I copied your question and did a search. This came up at the top of the page:
Nevertheless your feet can "mechanically" get larger as you age as your ligaments bones and muscles give in to age and become more relaxed. You can have a bigger shoe size as you get older but it isn't because you are still growing but because you are aging. You stop growing by age 24, feet and all.
It's estimated that many people over the age of 40 can gain half a shoe size every 10 years. So, have your feet measured often and don't get hung-up on the size on the shoe box but the actual fit of the shoe.” When do feet stop growing is a question shoe experts hear frequently.
I believe mine stopped growing by the time I was 14, maybe sooner, but if you become overweight it will make your shoe size bigger. I think maybe short people stop growing in all physical ways sooner because we reach our most attainable goal & can go no farther. This does not apply to the brain, only the rest of the body. My daughter was a child prodigy & she's only 5 feet tall.