Research has shown that learning a new skill helps the brain and improves memory, and the more difficult the skill, the more improvement you get. Coupled with exercise, these two things are considered important for long-term brain health and neuroplasticity. Studies show that slower learning over time helps build strong new linkages within the brain.
New knowledge will accumulate over time, as you keep putting effort into learning a new skill. Given that photography has so many elements, the science of light, the technology of the camera and the creative artistic side, there is a lot to learn. So whatever your age, now is the perfect time to start learning photography.