I shifted to being an early riser around 30. All it really took was for me to move into a place with unobstructed east-facing windows. Within a matter of months I was waking up at sunrise and bedtime had shifted from 2am to 10pm without any effort on my part.
Honestly, the only difference in my day to day has been when I do stuff. I'm still sleeping the exact same amount. I'm not more/less rested or alert during the day. I just do the same stuff in the morning that I'd have done in the evening previously.
The only benefit is that I no longer use an alarm. Work has flex hours and I don't have to be in until 10am, so I just wake up whenever I wake up and don't worry about it because there's plenty of time.