55 X 45cm in Cursive Script (草書)
"Longevity" (壽) is commonly used in celebrating birthdays. It is certainly a very positive greeting as it obviously carries the meaning of "Long Life".
Scientifically, the lifespan of a person depends on many variables such as diet, lifestyle, stress and genetics. Some factors you can control, some you can't. However, one thing is certain: no matter how well you manage these factors, you will certainly end up with death. So why be so obsessive in extending your lifespan? Life's focus should not be about how long you live but how well you do with your life. As Wen Tianxian (文天祥, 1236-1283 AD),
a renowned Chinese historical figure, once wrote: “What man was ever immune from death? Let me but leave a loyal heart shining in the pages of history.” (「人生自古誰無死，留取丹心照汗青。」, translated by Eveline Lee Zhiying.) This is in parallel to Christianity, wherein Jesus said: "Whoever loves his life loses it, and whoever hates his life in this world will preserve it for eternal life." -- if you do not do good deeds to expend your current limited life, you are then living a hollow life and wasting talent given to you by God, and so your reward of true longevity in Heaven may therefore be compromised.