Clearer Message Age Indication

At the moment you have "Today at 05:23" in light grey to show when a message arrived.

I was hoping you could incorporate something that's clearer that indicates, at a glance, how old a message is that involves colour coding.

For example green for seconds, yellow for minutes, red for hours, and grey for days or something along those lines. Perhaps even a progress bar to show how close to an hour the minutes are etc, but that's going to the extreme I know. Colour should suffice

Just an idea

Thanks