My youngest older brother (all five of my siblings are older than me ;-) ) grayed early like my mother. She had the most beautiful salt and pepper, then silver hair starting in her thirties. I have a few gray patches and strands in my medium brown hair at fifty and have colored it occasionally but I really dislike coloring it. When I had good money coming in and got it high-lighted at the salon it was okay but doing it at home on a budget I really dislike (can't stand the worry about making a mess and HATE waiting around for time to rinse)
In truth I often begrudge the time personal hygiene takes away from things I enjoy doing. Have completely abandoned hair styling altogether. No blow dryer or curling or straightening for me. It air dries however it will and I live with it.