Reptiles continue to grow slowly over the course of their life, right up until the day they die. Larger females usually produce larger clutches. So an old female will usually be bigger, and will lay more eggs.

From a species genetics standpoint, this is good. You want the old animals that have been successful and survived for a very long time to produce more offspring, and dominate the gene pool. From our perspective, this is also good--our older animals are even better producers than the younger ones.

This is typical of all reptiles--they do not undergo 'menopause', but continue to breed normally for as long as they live.