I wouldn't change a thing, life is never perfect, its what you make of it. I'd have to say that right now is my favorite time period, you never know what tomorrow will bring. I'm old enough to have have made plenty of mistakes and learned not to repeat them. I'm financially secure, no debt, and looking forward to my life beginning at 50....or so they say...
If I could change the past, and I did, I wouldn't be the same person I am today. No regrets, its all been a wonderful learning experience, thats how you grow as a person.