It is possible to stand more erect though it is not possible to actually "grow" the body physically in the vertical plane. The other growth, the growth that makes one more accepting of themselves and others, that growth can always be increasing.
I can definitely attest to this. After practicing yoga regularly for 6 months, I measured more than a full half-inch taller at my annual physical exam than I had the year before. The nurse was stunned. While I don't think I necessarily grew, I do think that my posture and alignment were improved to the degree that I can literally hold myself up higher than before.
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