After many years of genetic study, body augmentation is not only possible, but somewhat routine. It's not uncommon to see Felines with bionic arms and legs, relpacement or upgraded eyes and so on.

Not to mention all the stuff that can't be seen (such as brain augmentations).

There is also a brisk trade in illegal upgrades. Everything from boosts for mercenaries up to total body replacement for EVA work in orbit.

It is quite common to have the genetic material of the family 'tweaked' to the latest standards. The most frequent adjustments are simple reinforcements of the imunne system and life extension, plus increased resilience in free-fall.

As the proccess is relatively expensive, it's mostly the more well-off families that are able to perform such genetic improvements. However, since the change is essentially permanent, all future decendants of that individual will also benefit from that one transaction.