They mean long life. I remember you liked the calligraphy at the Palace Museum. So I thought you might like it.

长命百岁。我记得上次去故宫，你特别喜欢书法。所以，我想你可能会喜欢这个。

youdao

Usually I don't like to write long ones in calligraphy because I want to do calligraphy as enjoyment in leisure, and I think there is no need to make myself into a copy machine for the long ones.

通常我不喜欢书写长篇的书法，因为我要把写书法当作一种在休闲时的享受，而且我认为没有必要把自己弄成像复印机一样的来写长篇的东西。

youdao

I have many hobbies, I like to play the zither, calligraphy and reading, which I like most is playing the zither, because the music can make me relax, but I also love learning.

我的爱好有很多，我喜欢弹古筝、练书法和阅读，这其中我最喜欢的是弹古筝，因为音乐可以使我放松心情，但同样我也爱学习。

youdao