In the case of men, sperm quality declines with age, so a man is more or less fertile his entire life, but that may not hold true in the case of extreme longevity. If this decline in sperm-quality is due to age damage, then an age treatment may also improve sperm quality. But this is not guaranteed and may require its own specific treatment.
Women produce all the eggs they will ever produce before they are born. Menopause occurs when a woman runs out of eggs. So in the case of females, an anti-aging treatment is unlikely to extend her reproductive years beyond the current age of menopause (although it may make pregnancy safer and more viable during the latter half of her reproductive years). Like sperm, a woman's egg quality also declines with age, creating further difficulty.
So the idea that women will put off having children for a couple centuries seems to be a nonstarter lacking other advances as well, but it may be a possibility for men.
In the case of men, sperm quality declines with age, so a man is more or less fertile his entire life, but that may not hold true in the case of extreme longevity. If this decline in sperm-quality is due to age damage, then an age treatment may also improve sperm quality. But this is not guaranteed and may require its own specific treatment.
Women produce all the eggs they will ever produce before they are born. Menopause occurs when a woman runs out of eggs. So in the case of females, an anti-aging treatment is unlikely to extend her reproductive years beyond the current age of menopause (although it may make pregnancy safer and more viable during the latter half of her reproductive years). Like sperm, a woman's egg quality also declines with age, creating further difficulty.
So the idea that women will put off having children for a couple centuries seems to be a nonstarter lacking other advances as well, but it may be a possibility for men.