Yes, Age is just a number, you just need to feel young and happy from within. To justify this statement I am up with this amazing tortoise's picture, Can you relate his age according to it's beauty? This creature is adorable for sure.
Do you know Tortoise may live up to 150 years!!! I spotted this fabulous tortoise chilling near the pond. certainly like a beach for us :p! and dared to capture this beauty in my canon 700 D. Tortoise symbolizes longevity and are peaceful. according to me till the time a person may not loose their own charisma from within, they aren't considered old. living life to extreme is important. lively people are happiest and young, doesn't matter at what age biologically they may have reached.
learn to forget all the sorrow and pain because everyone owns it, cherish beautiful things you are gifted by nature and try to live happily.