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That experience marked a turning point in my life.

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This experience marked a turning point in my life.

This experience marked a watershed in my life. http://www.answers.com/topic/watershed

This experience was a turning point in my life.

This experience marked my life´s before and after.

This experience set a difference between who I was before and who I am now.

Saludos!!!!!

"That experience was a milestone in my life"

Espero que te sirva!!

Said experience changed my life in a before and after it.

The above mentioned experience marked one before and one later in my life . . . XD JEJEJE

such experience marked my life before and after

such experience marked an after and before on my life