I had a foot operation when I was 35, walking on crutches gave me freaky abs.
Back when I rode a road bike all clipped in I developed pretty good abs from pulling up when I pedaled.
Im 63 and now have 6 pack flabs. You can kind of tell there are some abs under there. I'm not particularly fat, just old. Plus I've gained and lost weight a few times which doesn't help.
I wish I had taken more pics when I was younger. I haven't always been an old lady, I don't self identify as one although right now my thoracic disk is reminding me I indeed am. Thank goodness for those magic shots.