I know very well that today is your birthday,
我知道得很清楚今天是你的生日
and wish you
祝你
all happiness, health and prosperity,
快乐 健康 幸福
With many happy returns of the day.
天天快乐
wish you a long and happy meaningful life
祝你长命百岁,生活美满
We may grow old together,
愿我们在有生之年
but as long as we are together,
一起慢慢变老