Different than alternative lifestyle (often used to describe being part of the LGBTQ+ community), alternate lifestyle describes a life outside the social norms. It may include making money by selling drugs, living as part of a gang, living on the streets by choice, choosing a job of stealing/robbery instead of a law abiding legal job. Living an alternate lifestyle is often a choice by someone (at first), where someone is choosing to live alternate to the lifestyle they are currently able to live. It is not someone living without a house due to job loss, or other unfortunate circumstances, it it a chosen lifetyle for whatever reason (looks/sounds cooler than what they are doing, friends are doing it, they are mad at parents and are choosing to live away instead of going home.).
Have you seen Joe?
Na, he's out selling and living un homed, he's trying an alternate lifestyle.
Ahh, yeah his parents are looking for him.