“Skater” need not respond.
It depends on the way you use it.
If all you want to say is “happy retirement”, it is “feliz jubilacion”. However, if you want to say it in a sentence … like “I hope you have a happy retirement”, you say “Espero que tengas una jubilacion feliz”.
Happy Retirement In Spanish
That’s what I received in cards when retiring from a particular function in a company.
Happy Retirement Sayings
i would say feliz jubilacion or retiro because you say “feliz cumpleanos” for happy birthday not “cumpleanos feliz”
Feliz Navidad y próspero año nuevo
My mom is hispanic and I asked and she said it was “Feliz jubilación”