I have to work until 67 in my country. So when I'll be off, I'll be way to tired to start new stuff. Moreover, after 50 years old, I'll get a good chance of getting cancer or some other life-changing disease. So I think it's better if I take my time right now...
Final note : this holds because my job is not a dream job, so my return-on-time-investment is weak (I don't consider the ability to buy a big car or around-the-world vacations, or top-notch-phone to be a good return on the time I spend at work)