Rachel, you're so right that small changes add up. Exercise and good nutrition are both things that we can work on every day to build new, better habits of living.
I've read that anywhere from 70% to a whopping 90% of so-called age related diseases are in our control. If we do all the basic things, cut sugar and processed foods, eat more fruits and veggies, get enough sleep and exercise, we can even overcome genetics as a factor.
It's a real possibility these days that many of us will live into our 90's. How we feel when we get there (and all the years between) is in large part due to the choices we make each and every day.
So next time you reach for that bag of chips or a fast food burger, try an apple, some homemade granola or a lean turkey sandwich on whole grain bread instead.