mid life crises ?

Far too many friends seem to be going through what outsiders would term "midlife crises". Perhaps I'm starting to have one of my own ? I've been thinking alot about bodies, nutrition, exercise - the what and how of being a 40 year old woman. Age is a funny thing, parts of you forget how old you are, and other parts are determined to remind you that you are ageing. Lately I've had a few more aches and pains - fingers, chest, elbow, shoulder - nothing major, but more than in the past.
I'm also more and more aware of my body, how it's "settling" and spreading. I don't like my tyre and it is a tyre, but I know I can do something about it if I get exercising. It's half term this week which means both boys are going to be around all day Monday, Tues, and Wednesday. I would like to go swimming etc. so will need to prioritise that if I want to do it at all.
I need to go to the library and start reading about these things - finding out more. I picked up a book the other day called "the Optimum Nutrition Bible" by Patrick Holford. The problem when you're my age (and my personality type) is that you're suspicious of almost everything. So my next question is 'why is this guy?' and 'what does he want to sell?'
I also noticed a headline in a magazine recently that said that women my age want things that work, not fly by night, pie in the sky, fads and fibs. Very true - when said of me.
My problem is that I don't care ENOUGH. This doesn't worry me ENOUGH. If it did - I would do something about it.