advice to your 40 year old self

I'm on mumsnet quite a lot (lurk here mostly!) and thought this was very interestinhg. www.mumsnet.com/Talk/am_i_being_unreasonable/2386273-If-youre-in-your-50s-and-60s-what-would-you-tell-your-40-year-old-self

I think I'd tell myself to worry about the small things less, really appreciate my DH and the time we spend together and not to ignore any health concerns - life's too short to worry about inconveniencing the doctor if you're really worried about something. What would you tell yourself?