There is no way to tell if your bones are closing at home. Bone closure is often referred to as epiphyseal closure and can be determined by age and imaging.
Normally, the epiphyses close around the age of 17 for males and 16 for females. However, not everyone has normal epiphyseal closure, and the secretion of hormones such as sex hormones, thyroid hormones, and adrenocorticotropic hormone can affect epiphyseal closure.
Imaging tests, such as X-rays or ultrasound, can be used to determine if the epiphyses are closing around localized joints. The epiphyses will slowly become thinner and thinner as the child grows older, and eventually ossify completely, at which point the epiphyses are considered to be completely closed and the child can no longer grow in height.
In addition, epiphyseal testing can be used as a reference for height management, but it is not a panacea to determine whether a child can continue to grow.