Is it okay to write "Shou" on the cake for an old man in his fifties' birthday?

Birthdays of folk old people are called birthdays, 60 years old is Hua Jiashou, 70 years old is Gu Xishou, 80 and 90 years old are very old, 100 years old is longevity, 60 years old is the first life, 80 years old is middle life, and 100 years old is longevity. Birthdays can only be called when you are fifty, and birthdays can only be called when you are less than fifty. Happy birthday: 77 years old, happy birthday cursive script looks like 77 meters: 88 years old, rice character looks like 88. ...

So you can write birthdays in your 50 s, but now aunts have a spirit of refusing to accept old age, so it is better to write happy birthday!