I use Rep-cal phos.-free calcium at most feedings no matter what the age. I use phos.-free calcium with D3 and Herptivite each twice a month lightly. Since the young get fed more often they get the calcium more often simply because they are fed more often.
I gutload my insects with a wide variety of greens (dandelions, kale, collards, endive, escarole, mustard greens, etc.) and veggies (carrots, squash, sweet red pepper, sweet potato, zucchini, etc.).
My veiled females usually live to be over 6 years of age and the males even older.