If you're looking for anime similar to Ginga Tansa 2100-nen: Border Planet, you might like these titles.
In the distant future, humans are no longer born, they are grown in test tubes and raised by robot companions until adolescence. Determined by genetics and skills at birth, each new member of society is trained for a specific job, from living as a noble to becoming a lowly pilot. For one young man named Godo, his quest for independence will send him across the stars and beyond the reaches of the phoenix, the only creature alive that can help breathe life into the dying Earth...
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Both are 80's anime that are based on the works of Osamu Tezuka. While they have different plots, they are both sci-fi and they both have a similar vibe. I think Hi no Tori 2772 is the better of the two, but if you like one you will probably like the other.
The official music video for Subarashii Shinsekai by Bajune Tobeta & Bonjour Suzuki.
While traveling by futuristic, galactic means, a girl is inadvertently plunged to a world below. Now surrounded by strange automatons and a very handsome man, she embarks on a new and interesting adventure…
Welcome to a world in which memories can be transferred from body to body; old painful memories can be removed and replaced with new ones, and the poor sell their bodies to the rich to survive. Waking up one day, Kaiba finds himself in a strange place with no memories of his past and a mysterious hole in his chest; the only clue as to his identity is a locket with a picture of a girl hanging from his neck. Armed with this token, Kaiba must now travel across the galaxy to discover who he is and what the girl in the locket means to him; however, his journey will bring him into contact with many people whose lives have been tragically affected by the manipulation of memories. All too soon it becomes clear that something is very wrong with this world…