Looking on the internet deeply has found these results:

the best year of my life is the most popular phrase on the web.

the best year in my life 1108,000 results on the web	the best year of my life 1367,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
I mean... you saved me from wasting the best years of my life. The best years of my life are ahead of me. The best years of my life were with a Marine. I think you understand that I don't want to sacrifice... the best years of my life for you. And I'd like to say it was the best year of my life. I was stuck in some cryogenic coffin, wasting the best years of my life. I do not want to waste the best years of my life for you. But being with you this last year, it's been the best year of my life, Brody.	He says, "This is going to be the best year of my life out there." I do not want to waste the best years of my life for you. I think you understand that I don't want to sacrifice... the best years of my life for you. The best years of my life are ahead of me. And I'd like to say it was the best year of my life. The best years of my life were with a Marine. But being with you this last year, it's been the best year of my life, Brody. I mean... you saved me from wasting the best years of my life.

the best year in my life

1108,000 results on the web

the best year of my life

1367,000 results on the web

More popular!

I mean... you saved me from wasting the best years of my life.
The best years of my life are ahead of me.
The best years of my life were with a Marine.
I think you understand that I don't want to sacrifice... the best years of my life for you.
And I'd like to say it was the best year of my life.
I was stuck in some cryogenic coffin, wasting the best years of my life.
I do not want to waste the best years of my life for you.
But being with you this last year, it's been the best year of my life, Brody.

He says, "This is going to be the best year of my life out there."
I do not want to waste the best years of my life for you.
I think you understand that I don't want to sacrifice... the best years of my life for you.
The best years of my life are ahead of me.
And I'd like to say it was the best year of my life.
The best years of my life were with a Marine.
But being with you this last year, it's been the best year of my life, Brody.
I mean... you saved me from wasting the best years of my life.