Good to start now.
Sprints, races, walks, stretching, sooryanamaskar, hanging exercises, deep breathing, meditation, high protein n iron rich food, greens, cow milk (of desi cow if you can arrange) and it's chhachh, ghee are must.
Antioxidant and growth herb combos to be taken regularly. Combos must be of good raw material and properly processed. If factors like hereditary status do not inhibit, you will gain good ht. That's sure.
Avoid otc products.