Wish you good luck in your old age, okay?

This is a good statement.

In Chinese culture, blessings are often delivered in time for specific festivals or celebrations to express respect and care for others. However, if this opportunity is missed for some reason, using "Wish you a good old age" as a way of blessing, although not the most ideal, is still a remedy to show that you still care about the other person and want to send blessings.

To a certain extent, this statement can alleviate the embarrassment caused by missing the blessing opportunity and convey respect and friendliness to the other party.