对长辈你可以说：祝你福如东海，寿比南山。dui zhangbei ni keyi shuo :zhu ni furu donghai ,shoubi nanshan.对同龄人说的最多的是生日快乐dui tongling ren shuo de zui duo de shi shengr kuaile。

Or say sth~ from bottom of your heart not the simple "happy birthday" say sth about the commom interests you both have ,and make some wish about them It just from my own part~~

Give sth~ done by yourself o(∩_∩)o... It's impressive and unforgettable by the man who receives the gift

i wish you have a very nice birthday

祝你生日快乐！zhu ni sheng ri kuai le!