The phrase "a lifelong path" is correct and usable in written English.
It can be used to describe a journey or course of action that lasts for an entire lifetime, often in the context of personal growth or commitment.
Example: "Choosing to pursue education is not just a temporary decision; it's a lifelong path that shapes who you become."
Alternatives: "an enduring journey" or "a lifelong journey".
Marriage is a lifelong path, one that you never perfect and that you continually work to get better at.
"After spending time in a rehab facility, I am committed to a lifelong path of recovery and making amends to those I have harmed.
Within a few weeks those baby steps can build into a formidable habit that will soon become second nature and put you on a lifelong path to financial health.
Under Verrochio's tutelage Leonardo discovered his immense talent and insatiable curiosity for the wonders of the world, leading him on a lifelong path filled with art, science and exploration.
It was in the California wilderness where John Muir, the unofficial "father of the national parks," was inspired to start down a lifelong path of environmental conservation--and it was the landscapes of Sequoia and Kings Canyon and surrounding areas that so compelled him.
Dr. King invited the "boy from Troy" to come meet him and helped spur young John Lewis on his lifelong path as a nonviolent warrior for justice who helped transform our nation.
But a formative experience studying at the University of California, Los Angeles, with Arnold Schoenberg, the towering Austrian composer and pioneer of the 12-tone technique, set Mr. Kirchner on a lifelong creative path.
And on top of all that, they have to commit to a lifelong career path.
"I feel like I'm on this solitary lifelong path," she said.
Befitting the bumpy nature of Collins's lifelong path, his career highlight was immediately followed by his career lowlight.
The teachings of Dr. Wayne Dyer were the first seeds planted that inspired me to blossom on this lifelong path of awakening and healing.
