Can we keep our Brain young always ...

Yes YOu can, it's there in Indian Yoga By Yogic powers and raising the consciousness in you, you can be keeping you brain always young. Try reading some yogic books. Then you will get some clue, but if you get a yogic guru then its better.

keep learning, stay interested in things. puzzles help keep the connections working better. Exercise and keep moving. The better the diet the better your health should be also.

Citrus fruit ismenat to help safeguard against alzheimers disease. I think usuing you brain keeps it working, if you never think about anything and watch daytime tv all day every day you're bound to feel dulled. Remember how you felt when you were at your best, most alert time in life and try to feel that good every day, maybe your diet and activites will contribute towards this too so eat well.