Translation of "88th" in Russian

I bought a scarf for my grandfather for his 88th birthday.

Я купил своему дедушке на восьмидесятивосьмилетие шарф.

My grandfather on my father's side is celebrating his 88th birthday tomorrow.

Мой дед по отцовской линии празднует своё 88-летие завтра.

- I bought a scarf for my grandfather on my father's side for his 88th birthday.
- I bought a scarf for my grandfather on my father's side's 88th birthday.

Я купил шарф в подарок своему дедушке со стороны отца на его восьмидесятивосьмилетие.

I bought a scarf for my grandfather on my father's side for his 88th birthday.

По случаю восьмидесятивосьмилетия моего дедушки по отцовской линии я подарил ему шарф.