What [not shmup] game are you playing now?

[NYN]

Is it retro now if it feels like something from a decade ago?

I should say no. It is the connotation with the term itself, something that feels way back now given the state of tech. Youths who never experienced such ages should not have use of it. It marks them as such.
Reverse to more mature ones using flashy lingo.

How does the feature feel in 80/90 games (Deus EX/System Shock) when played now? BioShock as the latest.

[vol.2]

I should say no. It is the connotation with the term itself, something that feels way back now given the state of tech.

Agree. There is a soft cutoff in like 2010ish when graphics and gameplay reached a point to which you could find new games that continued to look and play like previous generation games. Those games coexisted with flashier, cutting edge games, but they weren't considered old anymore in the same way that previous generations did. To use an extreme example, the difference between SNES and N64 was incredibly apparent, but the gap closed a lot between Gamecube and Wii, and things continued to move in that direction, closing the gap more and more with each passing year.

The emergence of retro gaming as a hugely popular hobby also helped to muddy the waters further, as it led to the popularization of newer games that looked and played more like games from the past. Those aesthetics were not just limited to games that were explicitly created as "retro," but entered into the wider vernacular of video game style.