I'm late 30s, throughout my life my diet hasn't been very good but it probably hasn't been horrendous either. I've never eaten enough veg.
Several years ago dh and I were in a rut and our diet became very bad, loads of takeaways, way too much junk processed food. Both put on weight.
So a few years ago we turned our whole lifestyle around and now eat well, we exercise every day. Every so often we go on a complete health kick and eat very clean. We go to bed early, rarely drink generally I'd say we have a very healthy lifestyle.
I do wonder though sometimes how much difference it honestly makes. To be honest nearly everyone I know eats what they want. Dh often tells me while he's eating his salad or healthy sandwich or homemade whatever all his workmates are eating Greggs, pizza, sausage rolls crisps chocolate bars.
Apart from being slimmer I can't honestly say I feel massively different to when I was eating junk food all the time. Can't say I've got glowing skin or that I'm full of energy.