" I say," said George, rapidly, " let's go, shall we ?

[englishhobby]

In the following passage (from the story 'Honeymoon' by K. Mansfield) the phrase 'I say' is used to attract attention. Is it common these days or it will sound dated if I use it?

As she turned to him something in her soft, wondering look made George feel that for two pins he would jump over the table and carry her off.

" I say," said George, rapidly, " let's go, shall we ? Let's go back to the hotel. Come. Do, Fanny darling. Let's go now."

 

[Rover_KE]

It will sound dated if you use it.

 

[Phaedrus]

Between World War I and World War II, it seems to have been used at Cambridge.

"I say, Abrahams. What have you got on your feet? Rockets?" (Chariots of Fire, 1981)